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Risk Factors: Measuring and Rating Health, Illness, and Mortality
The USSC used 18 classes of nativity in many of the statistical tables generated by their research. This page of Gould's "Investigations" explained the designations. Page 92 of Benjamin A. Gould, Investigations in the Military and Anthropological Statistics of American Soldiers. New York: Arno Press, 1979. (Reprint of Vol. 2 of the 1869 Edition of the United States Sanitary Commission's Sanitary Memoirs of the War of the Rebellion, published for the commission by Hurd and Houghton, New York.)
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The National Library of Medicine believes this item to be in the public domain.