Estados Unidos. Bureau of the Census, & Estados Unidos. Bureau of the Census. (1960). Historical statistics of the United States colonial times to 1957: A statistical abstract suplement, prepared by the Bureau of the Census with the cooperation of the Social Science Research Council. Washington: U.S. Departamento of Commerce.

Estados Unidos. Bureau of the Census, and Estados Unidos. Bureau of the Census. Historical Statistics of the United States Colonial Times to 1957: A Statistical Abstract Suplement, Prepared By the Bureau of the Census With the Cooperation of the Social Science Research Council. Washington: U.S. Departamento of Commerce, 1960.

Estados Unidos. Bureau of the Census, and Estados Unidos. Bureau of the Census. Historical Statistics of the United States Colonial Times to 1957: A Statistical Abstract Suplement, Prepared By the Bureau of the Census With the Cooperation of the Social Science Research Council. Washington: U.S. Departamento of Commerce, 1960.