Supplementary analysis and derivative tables. Twelfth census of the United States
United States. Census Office. 12th census, 1900; Willcox, Walter Francis, 1861-1964; Young, Allyn Abbott, 1876-1929; Billings, John S. (John Shaw), 1838-1913; Hill, Joseph A. (Joseph Adna), 1860-1938; Du Bois, W. E. B. (William Edward Burghardt), 1868-1963