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References
- ↑ Collected Reprints of McBee's Annual Reviews of Halogenation, 1948–1958: Reprinted from Industrial and Engineering Chemistry for Columbia-Southern Chemical Corporation. 1950. p. 2082.
- ↑ Gribbin, John H.; Krogfus, Sue Singer (1960). Industrial Research Laboratories of the United States (11 ed.). Washington, D.C.: National Academy of Sciences—National Research Council. p. 117 #884–891, p. 374 #2984. LCCN 21-26022.
- ↑ "Progress at Pittsburgh Plate – In CHemical Operations". Pittsburgh Post-Gazette. January 4, 1956. p. 20. Retrieved January 29, 2016.
- 1 2 "Columbia-Southern Chemical Corporation". The Cornell Daily Sun. Ithaca, New York. February 15, 1960. p. 5. Retrieved January 29, 2016.
- ↑ Hempstead, Colin A., ed. (2004). Encyclopedia of 20th-Century Technology. Vol. 2 M-Z. New York and London: Routledge. p. 563, Optometry – Materials. ISBN 1579584640.
- ↑ "Plastic – Materials used for Plastic Lenses". Where does the name CR 39 come from?. Carl Zeiss Vision Inc. Retrieved January 28, 2016.
- ↑ "Ammonia Unit for Natrium". Pittsburgh Post-Gazette. August 12, 1953. p. 19. Retrieved January 29, 2016.
- ↑ "Chemical Firm Extends Program". Pittsburgh Post-Gazette. May 1, 1952. p. 21. Retrieved January 29, 2016.
- ↑ Mauriello, Tracie (November 1, 2015). "Pittsburgh companies part of $7 billion claim against Cuba". Pittsburgh Post-Gazette. Washington Bureau. Retrieved January 29, 2016.
