Comparison of Dewey and Library of Congress subject classification

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Dewey Decimal and Library of Congress library classification systems organize resources by concept, in part to assign call numbers that are used to shelve and retrieve materials. [1] Most libraries in the United States use one of these two classification systems. [2] Dewey Decimal Classification (DDC) is the most commonly used library cataloging system in the world, and is used predominantly in public libraries in the United States. [3] while Library of Congress Classification (LCC) is used primarily in academic libraries. [4]

Contents

Characteristics

Both classification systems are used to create a topical order of the resources on the library shelves. They vary in their use of notation: DDC is a numeric classification system, while LCC is a alpha-numeric system. [5] [6] LCC was developed specifically for the Library of Congress collection, while DDC was created as a system that could be adapted to a variety of library sizes and specialties. [6] However, as with any classification system, both DDC and LCC include the bias of their creators; in this case, both systems were developed by white, Christian, male academic scholars in late 19th century America. [7]

The Dewey Decimal Classification (DDC) was first published by Melvil Dewey as a pamphlet in 1876, and was sent to several American librarians for review. That draft included a detailed justification for his use of decimal notation. [8] DDC decimal notation can be expanded or reduced as needed by libraries. It was designed for medium and small sized collections, [9] [10] including those found in public libraries, school libraries, and small academic libraries. [11] [12] [13] It consists of ten numeric classes that represent broad fields of study. [12] [11] [3] Using numbers, each class is divided into ten divisions or subclasses. [2] [3] During the cataloging process, each item is assigned a three-digit DDC number that represents class, division, and section, followed by a cutter number that identifies the author. [14] For example, the call number 813.54 M37 includes 800 for the main class of literature, 810 for the division of American literature in English, 813 for American fiction in English, and the cutter M37 for the author. [14]

The Library of Congress Classification was introduced in 1900, based on the collection of the Library of Congress, the largest library in the world. [15] [6] LCC was adopted by other institutions with larger or specialized collections, such as those found in academic libraries and research libraries. [4] [11] [12] [13] [15] For example, in 2019, 81 percent of US academic libraries and 93 percent of Nigeria's academic libraries used the Library of Congress Cataloging system. [16] LCC has 21 main classes, each designated with a letter of the alphabet. [12] [11] Its alpha-numeric call numbers include four parts: class/subclass, topic, cutter number, and publication date. [11] [2] For example, HV4708 .R83 2011, where HV stands for social sciences, 4708 is the topic social welfare, .R83 is the cutter number which represents the author, and 2001 is the year of publication. [11] LCC does not use letters I, O, W, X, or Y, and these letters can be used to accommodate special needs of libraries using the classification scheme. [17] [1]

There are various factors that determine which classification system a library uses. The global library cooperative OCLC notes that "A library should base its decision on close versus broad classification on the size of its collection and the needs of its users." [18] Usually, the size of a library's collection determines whether it selects DDC or LCC. [12] While DDC was designed for medium sized libraries, [19] LCC allows libraries will larger collections to be more specific or precise with classifications. [12] [11] In the 1960s and early 1970s, many larger academic libraries changed from Dewey Decimal Classification to Library of Congress Classification. [20] After converting the college's library from DCC to LCC in 2021, West Coast Baptist College's director of library services Alyssa Sultanik concluded, "LCC tends to divide resources into smaller subclasses and may be more suitable for larger collections. Several factors can play a part in the success of LCC, such as the practicality of LCC for academic libraries, the ease of use in a specialized collection, and the ability to grow for expanding libraries and the ability to easily add new topics as needed. The collection size, depth of the materials, and intended use of the library collection should be considered when choosing between classification systems...Smaller collections may be more suited for DDC because of the classifications more generalized nature." [17]

Comparison

The following table compares the organization of resources by the Dewey Decimal and Library of Congress classification systems. [3] [21] [22] [23] [24] [25] [26] It includes all 99 second-level (two-digit) Dewey Decimal classes (excluding 040), and all second-level (two-digit) Library of Congress classes. If a class in one system maps to several classes in the other system, it will be listed multiple times, such as DDC class 551.

Dewey DecimalLibrary of CongressDescriptionRef.
000QA71–90 Computer science, knowledge, and general works [27]
001AKnowledge [28]
002Z4-659The book [29]
003Systems
004QA (subrange) Data processing and computer science [27]
005QA (subrange) Computer programming, programs, and data [27]
006QA (subrange)Special computer methods [27]
010Z1001–8999 Bibliography [29]
020Z665–718.8 Library and information sciences [29]
030AE General encyclopedic works [28]
050AIGeneral serials and their indexes [28]
060AM111–160General organization and museology [28]
070AN News media [28]
070PN4699–5650 Journalism [30]
070Z278–549 Publishing [29]
080ACGeneral collections [28]
090Z105–115.5 Manuscripts [29]
090Z1019–1033 Rare books [29]
100B Psychology and philosophy [31]
111BD300–450 Ontology [31]
115BD493–701 Time [31]
120BD143–237 Epistemology [31]
120BD? Causation [31]
120BD? Humankind [31]
124BD493–701 Teleology [31]
130BF1404–2055 Paranormal phenomena and occult sciences [31]
150BF Psychology [31]
152HM1041–1101 Perception [32]
152QH? Movement [27]
152BF511–593 Emotions [31]
155BF712–724 Developmental psychology [31]
160BC Logic [31]
170BJ Ethics (moral philosophy) [31]
180B108–708 Classic philosophy [31]
181B850–5739 Oriental philosophy [31]
182B108–708 Ancient philosophy [31]
183B108–708 Sophists and Socratic philosophies [31]
185B108–708 Aristotelian philosophy [31]
186B108–708 Skeptic and Neoplatonic philosophies [31]
187B108–708 Epicurean philosophy [31]
188B108–708 Stoic philosophy [31]
189B720–765 Medieval Western philosophy [31]
190B790–5802 Modern Western philosophy [31]
200BL Religion [31]
210BL175–265 Natural theology [31]
212BL205–216 Nature of God [31]
220BS Bible [31]
221BS701–1830 Old Testament [31]
225BS1901–2970 New Testament [31]
226BS2547–2970? Gospels and Acts of the Apostles [31]
227BS2640–2765.6 Epistles [31]
228BS2547–2970? Revelation [31]
229BS2547–2970? Apocrypha [31]
230BR Christian theology [31]
232BT198–590 Jesus and his family [31]
236BT819–891 Eschatology [31]
250BR? Christian orders and local church [31]
260BR?Christian social theology [31]
270BR140–1510Christian church history [31]
280BX? List of Christian denominations [31]
282BX800–4795 Roman Catholic church [31]
283BX5001–6093 Anglican churches (English and Protestant Episcopal) [31]
284BX? Protestants of continental origin [31]
286BX6201–6495, BX7301–7343, BX6101–6193 Baptist, Disciples of Christ, and Adventist [31]
287BX8201–8495 Methodist and related churches [31]
289BX7601–7795, BX7801–7843, BX8101–8144,

BX 8799–8809, BX9751–9793, BX9998

Other denominations and sects [31]
290BL660–2680 Non-Christian religions [31]
292BL700–820 Greek mythology and Roman mythology [31]
295BL1500–1590 Zoroastrianism [31]
296BM Judaism [31]
297BP Islam, Bábísm, and Baháʼí Faith [31]
300H Social sciences [32]
301HM Sociology [32]
301GN Anthropology [33]
310HA154–473General statistics (of parts of the world) [32]
320J Political science [34]
327JZ International relations [34]
330HB Economics [32]
331HD4801–8943 Labor economics [32]
332HG Financial economics [32]
333HD101–1399Economics of land [32]
333HD9502Economics of energy [32]
336HJ Public finance [32]
339HB? Macroeconomics [32]
340K Law [35]
341KZ International law [35]
345K5000–5582 Criminal law [35]
346KB479 Private law [35]
347K2201–2385 Civil procedure [35]
347K2100–2385 Courts [35]
350JF Public administration [34]
352JS City government [34]
353JK1–9593 U.S. federal government [34]
353JK2403–9593 U.S. state governments [34]
355U Military science [36]
360H Social services and association [32]
361HNGeneral social problems and services [32]
362HN Social welfare problems and services [32]
363HNOther social problems and services [32]
364HV6001–7220 Criminology [32]
365HV8301–9920 Penal and related institutions [32]
366HSAssociation [32]
367HS General clubs [32]
368K1960–1973(Social) Insurance [35]
370L Education [37]
371LB3011–3095School management [37]
371LC3950–4806.5 Special education [37]
372LB1501–1602 Elementary education [37]
373LB1603–1699 Secondary education [37]
374LC5201–6661 Adult education [37]
376LC1401–2572 Education of women [37]
377LC321–951Schools and religion [37]
378LB2300–2430 Higher education [37]
380HF Commerce, communications, and transport [32]
382HF1 International commerce (foreign trade) [32]
383HE6000–7500 Postal communications [32]
384HE Communications [32]
384HE7601–8700.9 Telecommunication [32]
385HE1001–5600 Railways [32]
386HE380–560 Inland waterway [32]
386HE5751–5870 Ferry transportation [32]
387HE380–971 Water transportation [32]
387HE9761–9900 Air transportation [32]
387TL787–4050 Space transportation [38]
388HE Transport [32]
390GT Customs [33]
390BJ1801–2195 Etiquette [31]
390GR Folklore [33]
391GT500–2370 Costume and personal appearance [33]
392GT2400–3390.5Customs of life cycle and private life [33]
393GT2400–3390.5 Customs of Death [33]
395BJ1801–2195 Etiquette [31]
398GR Folklore [33]
400P Language [30]
410P101–410 Linguistics [30]
411P327–327.5 Writing systems [30]
412P321–324.5 Etymology [30]
414P? Phonology phonetics [30]
415P201–299 Grammar [30]
419PM8001–8995 Sign language [30]
420PE English language [30]
430PD Germanic languages [30]
440PC2001–3761 French language [30]
449PC3201–3366 Provençal [30]
449PC3801–3976 Catalan [30]
450PC1001–1977 Italian language [30]
459PC601–872 Romanian language [30]
459PC901–986 Rhaeto–Romanic language [30]
460PC4001–4977 Spanish language [30]
469PC5001–5498 Portuguese language [30]
470PA2001–2915 Latin language [30]
480PA201–899 Greek language [30]
490P501–769 Indo-European Languages [30]
492PJ991–995 Afro-Asiatic languages [30]
494PL1–481 Altaic languages [30]
495PL3521–4001 Sino-Tibetan languages [30]
496PL8000–8844 African languages [30]
497PM101–2711North American languages (Native American languages) [30]
498PM3001–4566Central American Languages (Native American languages) [30]
498PM5001–7356South American Languages (Native American languages) [30]
500Q Natural sciences and mathematics [27]
510QA Mathematics [27]
512QA150–272 Algebra [27]
513QA101–145 Arithmetic [27]
514QA612–699 Topology [27]
515QA299–433 Analysis and calculus [27]
516QA440–611 Geometry (excluding topology) [27]
519QA273–299 Probability, statistics, and numerical analysis [27]
520QB Astronomy [27]
521QB349–421 Celestial mechanics [27]
530QC Physics [27]
531QC120–168.85 Classical mechanics and solid mechanics [27]
532QC120–168.85 Fluid mechanics and liquid mechanics [27]
533QC120–168.85 Gas mechanics [27]
534QC221–246 Sound and related vibrations [27]
535QC350–467 Light and paraphotic phenomena [27]
536QC251–338.5 Heat [27]
537QC501–721 Electricity and electronics [27]
538QC750–766 Magnetism [27]
539QC770–798 Modern physics [27]
540QD Chemistry and allied sciences [27]
541QD450–801 Physical chemistry and theoretical chemistry [27]
542QD1–65Techniques, equipment, and materials (laboratory) [27]
543QD71–142 Analytical chemistry [27]
544QD71–142 Quantitative analysis (chemistry) [27]
545QD71–142 Quantitative analysis (chemistry) [27]
546QD146–197 Inorganic chemistry [27]
547QD241–441 Organic chemistry [27]
548QD0001–0999 Crystallography [27]
549QE351–399.2 Mineralogy [27]
550QE Earth sciences [27]
551QE Geology [27]
551GB651–2998 Hydrology [33]
551QC851–999 Meteorology [27]
552QE420–499 Petrology [27]
553QE? Economic geology [27]
560QE701–760 Paleontology [27]
560QE7601–899 Paleozoology [27]
570QH301–705.5 Life sciencesbiology [27]
572QD415–436 Biochemistry [27]
572GN Anthropology [33]
573GN49–298 Physical anthropology [33]
574QH301–705.5 Biology [27]
575QH359–425 Evolution [27]
575QH426–470 Genetics [27]
576QH573–671 Microbiology [27]
577QH540–549.5 Ecology [27]
578QH201–278.5 Microscopy in biology [27]
579QH1–199.5Collection and preservation (biological specimens) [27]
580QKBotanical sciences [27]
581QK Botany [27]
582QK474.8–495 Spermatophyta (seed-bearing plants) [27]
585QK494–494.5 Gymnospermae (Pinophyta) [27]
586QK504–638 Cryptogamia (seedless plants) [27]
590QL Animals [27]
591QL1–355 Zoology [27]
592QL360–599.82 Invertebrates [27]
593QL360–599.82 Protozoa, Echinodermata, and related phyla [27]
594QL360–599.82 Mollusca and Molluscoidea [27]
595QL360–599.82Other invertebrates [27]
596QL605–739.8 Vertebrata (Craniata and vertebrates) [27]
597QL614–639.8 Fishes [27]
597QL640–669.3 Reptiles and amphibians [27]
598QL671–699 Aves (birds) [27]
599QL700–739.8 Mammalia (mammals) [27]
600T Technology (applied sciences) [38]
607T61–173 Education [38]
607T175–178 Research [38]
608T201–342 Invention and patents [38]
608Q Invention and patents [27]
610R Medicine [39]
611QM Human anatomy [27]
611QH573–671 Cytology [27]
611QM550–577.8 Histology [27]
612QP Human physiology [27]
615RM Pharmacology and therapeutics [39]
617RD Surgery and related topics [39]
618RG Gynecology [39]
618ROther medical specialties [39]
619R735–854 Experimental medicine [39]
620TA Engineering and allied operations [38]
621TJ Mechanical engineering [38]
621QC Applied physics [27]
622TN Mining and related operations [38]
623UG1–620 Military engineering [36]
623VM Nautical engineering [40]
624TA Civil engineering [38]
TG Bridge engineering [38]
625TF Engineering of railways [38]
625TE Engineering of highways [38]
627TC1–978 Hydraulic engineering [38]
628TD Sanitary engineering [38]
628TD159–168 Municipal engineering [38]
629TOther branches of engineering [38]
TK Electrical engineering, electronics, and nuclear engineering [38]
TL Motor vehicles, aeronautics, and astronautix [38]
TP Chemical technology [38]
630S Agriculture [41]
631S1–972Techniques, equipment, and materials [41]
632SB599–990.5 Plant injuries, diseases, and pests [41]
633SB317.5–319.864 Horticulture [41]
634SB354–402 Fruits [41]
634SD Forestry [41]
634SB169–172.5 Orchards [41]
636SF Animal husbandry [41]
637SF250.5–275 Processing dairy and related products [41]
638SF518–561 Insect culture [41]
639SK Hunting and fishing [41]
639S604.5–604.64 Conservation [41]
640TX Home economics [38]
650HD28–70 Management and auxiliary services [32]
653Z53–102 Shorthand [29]
657HF5601–5689 Accounting [32]
658HD28–70 General management [32]
659HF5801–6182 Advertising [32]
660TP155–156 Chemical engineering [38]
670HD9720–9975 Manufacturing [32]
680TT Handicrafts [38]
690TH Buildings [38]
700N Arts [42]
708N400–3990 Museums [42]
710SB469–476 Landscape art [41]
720NA Architecture [42]
730NB Plastic arts and sculpture [42]
736NB0001–1952 Carving and carvings [42]
738NB0001–1952 Ceramic arts [42]
739NB0001–1952 Metalwork [42]
740NC Drawing [42]
740NK Decorative arts [42]
746NK8800–9505.5 Textile arts [42]
748NK5100–5440 Glass [42]
749NK2200–2750 Furniture and accessories [42]
750ND Painting [42]
760NE Graphic arts, printmaking, and prints [42]
761NE1330–1352Relief processes (block printing) [42]
763NE2250–2570 Lithography [42]
764NE2236–2240.6 Chromolithography and serigraphy [42]
765NE1400–1879 Metal engraving [42]
767NE1940–2232.5 Etching and drypoint [42]
770TR Photography and photographs [38]
780M Music [43]
781MTGeneral principles and musical forms [43]
782M1495–5000 Vocal music [43]
783M1528–1529.5Music for solo voice [43]
784M1000–1075 Orchestras and ensembles [43]
785M1000–1075Ensembles with one instrument per part [43]
786MT180–255 Keyboard instrument [43]
787MT259–338 String instruments [43]
788MT339–533 Wind instruments [43]
790PN1560–1590 Performing arts [30]
790GV Recreation [33]
792PN2000–3307 Theater and other stage presentations [30]
793GV1221–1469.63 Indoor games and amusements [33]
795GV1301–1311 Games of chance [33]
796GV557–1198.995 Sport [33]
797GV750–770.27 Air sports [33]
797GV770.3–840 Aquatic sports [33]
799SK Fishing, hunting, and shooting [41]
800P Literature and rhetoric [30]
810PS American literature [30]
820PR English literature [30]
830PT1–4897 German literature [30]
840PQ0001–3999 French literature [30]
850PQ4001–5999 Italian literature [30]
860PQ6001–8929 Spanish literature [30]
869PQ9000–9999 Portuguese literature [30]
870PA6001–8595 Latin literature [30]
880PA3050–5660 Greek literature [30]
890PN World literature [30]
900G Geography [33]
900D History [44]
910G Geography [33]
911G141 Historical geography [33]
912GAGraphic representations of earth (maps) [33]
914G1791–2196 Geography of Europe [33]
915G2200–2444 Geography of Asia [33]
916G2445–2739 Geography of Africa [33]
917G1105–1692 Geography of North America [33]
918G1700–1779 Geography of South America [33]
919G2740–2799 Geography of Oceania [45]
920CT Biography [45]
920CS Genealogy [45]
920CR4480–4485 Insignia [45]
930D51–90 History of ancient world [44]
938DE History of the Greco-Roman World [44]
940DAW1031–1051 History of Europe [44]
942DA History of Britain [44]
943DD History of Germany [44]
943.6DB History of Austria and history of Liechtenstein [44]
943.9DB History of Hungary [44]
944DC History of France [44]
945DG History of Italy [44]
946DP History of the Iberian Peninsula [44]
947DJK History of Eastern Europe [44]
947DK History of Russia, Soviet Union, and former Soviet republics [44]
948DL History of Northern Europe and history of Scandinavia [44]
949.2DH History of the Netherlands [44]
949.3DH History of Belgium [44]
949.4DQ History of Switzerland [44]
949.5DF History of Greece [44]
949.6DR History of the Balkan peninsula [44]
950DSGeneral history of Asia and Far East [44]
951DS701–799.9 History of China [44]
952DS801–897 History of Japan [44]
953DS201–248 History of Arabian Peninsula (history of Saudi Arabia, etc.) [44]
954DS401–486.8 History of India [44]
955DS251–326 History of Iran (Persia) [44]
960DT History of Africa [44]
961DT211–239 History of Libya [44]
961DT241–269 History of Tunisia [44]
962DT154.1–159.9 History of Sudan [44]
962DT43–154 History of Egypt [44]
963DT371–390 History of Ethiopia (Abyssinia) [44]
963DT391–398 History of Eritrea [44]
965DT271–299 History of Algeria [44]
966DT470–671 History of West Africa and offshore islands [44]
967DT? History of Central Africa and offshore islands [44]
968DT1701–2405 History of South Africa [44]
969DS349.8–349.9 [46] [44]
970F History of North America [46]
971F1001–1145.2 History of Canada [46]
972F1421–1440 History of Central America [46]
972F1201–1392 History of Mexico [46]
973E History of United States [46]
980F2201–3799 History of South America [46]
981F2501–2659 History of Brazil [46]
982F2801–3021 History of Argentina [46]
983F3051–3285 History of Chile [46]
984F3301–3359 History of Bolivia [46]
985F3401–3619 History of Peru [46]
987F2301–2349 History of Venezuela [46]
988F2351–2471History of Guiana [46]
990DUHistory of Oceania [44]
993DU400–430 History of New Zealand [44]
994DU80–398 History of Australia [44]
995DU490 History of Melanesia [44]
995DU739–747 History of New Guinea [44]
803AG Dictionaries and other general reference works [28]
069AM Museums, collectors, and collecting [28]
050AP Periodicals [28]
060–068AS Academies and learned societies [28]
030AY Yearbooks, almanacs, and directories [28]
001AZ History of scholarship and learning, and the humanities [28]
110–140BD Speculative philosophy [31]
111.85BH Aesthetics [31]
200BL Mythology [31]
230BT Doctrinal theology [31]
240–260BV Practical theology [31]
280BX Christian denominations [31]
C Auxiliary sciences of history (general) [45]
909CB History of civilization [45]
930.1CC Archaeology [45]
929.1 – 929.3CD Diplomatics, archives, and seals [45]
529CETechnical chronology and calendar [45]
737CJ Numismatics [45]
411.7CN Inscriptions and epigraphy [45]
929.6CR Heraldry [45]
909.0491497DX History of Romanies [44]
551.4GB Physical geography [33]
551.46GC Oceanography [33]
333.7GE Environmental sciences [33]
304GF Human ecology and anthropogeography [33]
310HA Social science statistics [32]
330.9HC Economic history and conditions [32]
331–338HDIndustries, land use, and labor [32]
649.1–641.7HQ Family, marriage, and women [32]
HT Communities, classes, and races [32]
364HV Social pathology, social and public welfare, and criminology [32]
335HX Socialism, communism, and anarchism [32]
JGeneral legislative and executive papers [34]
320JA Political science (general) [34]
320.5JC Political theory [34]
JJPolitical institutions and public administration (North America) [34]
320.973JKPolitical institutions and public administration (United States) [34]
320.971JLPolitical institutions and public administration (Canada, Latin America, etc.) [34]
320.94JNPolitical institutions and public administration (Europe) [34]
320.95–320.969JQPolitical institutions and public administration (Asia, Africa, Australia, Pacific Area, etc.) [34]
JV Colonies and colonization, emigration and immigration, and international migration [34]
KB Religious law (general) and comparative religious law and jurisprudence [35]
KD Law of the United Kingdom, Ireland, America, and North America [35]
340.971KE Law of Canada [35]
340.973KF Law of United States [35]
KGLaw of Latin America – Mexico, Central America, the West Indies, and the Caribbean area [35]
KH Law of South America [35]
340.94KJ–KK Law of Europe [35]
340.95–340.969KL–KW Law of Asia and Eurasia, Africa, Pacific Area, and Antarctica [35]
370.9LA History of education [37]
370.1LB Theory and practice of education [37]
LCSpecial aspects of education [37]
378.73–378.79LDIndividual educational institutions – United States [37]
378.8LEIndividual educational institutions – America (except United States) [37]
378.4LFIndividual educational institutions – Europe [37]
378.5–378.6LGIndividual educational institutions – Asia, Africa, Indian Ocean islands, Australia, New Zealand, and Pacific islands [37]
378LHCollege and school magazines and papers [37]
LJ Student fraternities and societies, United States [37]
LT Textbooks [37]

See also

Further reading

References

  1. 1 2 Francis, Frank C.; Estabrook, Leigh S. (2025-08-09). "The Dewey Decimal system". Britannica. Retrieved 2025-09-01.
  2. 1 2 3 "Cataloging Tools and Resources: Classification". American Library Association. Retrieved 2025-08-21.
  3. 1 2 3 4 Summaries DDC: Dewey Decimal Classification (PDF). Dublin, Ohio: OCLC Online Computer Library Center, Inc. 2003. ISBN   0-910608-71-7 . Retrieved August 28, 2025.
  4. 1 2 Lavallee, Andrew (July 20, 2007). "Discord Over Dewey: A New Library in Arizona Fans a Heated Debate Over What Some Call the 'Googlization' of Libraries". Wall Street Journal. Retrieved May 25, 2013.
  5. List-Handley, Carla J. (2002). Information Research. Kendall Hunt. p. 5. ISBN   978-0-7872-9057-3 via Google Books.
  6. 1 2 3 Bullard, Eric. "Library of Congress Classification (LCC) | Research Starters". EBSCO. Retrieved 2025-09-01.
  7. Christiansen, Andrew (2022-04-14). "SLCC switches library classifications". The Globe. Retrieved 2025-09-03. Jon Glenn, director of library services, said we … wanted to make our system more equitable and inclusive, which isn't really a question of which system was originally more biased, but rather which system...can be more easily improved upon...Any classification system is rooted in and biased by its creator and the time under which it was created. Glenn added that this applies to DDC and LCC, which were both developed in the United States during the 19th century by academic scholars who were white, male, and Christian.
  8. Comaromi, John P. (1976), The eighteen editions of the Dewey Decimal Classification, Albany, N.Y: Forest Press Division, Lake Placid Education Foundation, p. 43, ISBN   978-0-910608-17-6, OL   4881898M
  9. Hjørland, Birger (2025). "Dewey Decimal Classification (DDC)". Em Questão. 31. doi:10.1590/1808-5245.31.145068. ISSN   1808-5245.
  10. Universal Decimal Classification (UDC) was created in 1905 based on DDC 5th edition to address the needs of large libraries.
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