Special reports : supplementary analysis and derivative tables : twelfth census of the United States, 1900 - United States. Bureau of the Census; Young, Allyn Abbott; Billings, John Shaw; Hill, Joseph A. (Joseph Adna); Du Bois, W. E. B. (William Edward Burghardt); Willcox, Walter F. (Walter Francis) (Govt. Print. Office, 1906)