Nikolai Severtzov (1873). "Vertical and Horizontal Distribution of Turkestan Wildlife" Proceedings of the Imperial Society of Amateurs of Natural Sciences, Anthropology and Ethnography of Moscow. 8 (2). p 270. (in Russian)
Paolo SaviOrnitologia Italiana Firenze :Successori Le Monnier,1873-1876. (opera posthuma 1873–1876) BHL
Elliott Coues 1873. Some United States birds, new to science, and other things ornithological. The American Naturalist 7: 321–331.
Ongoing events
Theodor von HeuglinOrnithologie von Nordost-Afrika (Ornithology of Northeast Africa) (Cassel, 1869–1875)
John Gould The Birds of Asia 1850-83 7 vols. 530 plates, Artists: J. Gould, H. C. Richter, W. Hart and J. Wolf; Lithographers: H. C. Richter and W. Hart
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