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Journal Article The Pharmacopoeia of the United States Get access (The United States Pharmacopoeia), Thirteenth Revision, U.S.P. XIII. Prepared by the Committee of Revision and published by the Board of Trustees by authority of the U. S. Pharmacopoeial Convention meeting at Washington, D. C., May 14 and 15, 1940. 957 pp., 12 figs., 23 tables. $8.00. Easton, Pennsylvania: Mack Printing Company, 1947. American Journal of Clinical Pathology, Volume 17, Issue 11, 1 November 1947, Pages 887–888, https://doi.org/10.1093/ajcp/17.11.887a Published: 01 November 1947
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A 1947 study studied this question.
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