Washington, DC : U.S. Dept. of Commerce, Economics and Statistics Administration, Bureau of the Census : For sale by the Supt. of Docs., U.S. G.P.O., 1991
Washington, DC : U.S. Dept. of Commerce, Economics and Statistics Administration, Bureau of the Census : For sale by the Supt. of Docs., U.S. G.P.O., 1993