[Washington, D.C.] : U.S. Dept. of Commerce, Economics and Statistics Administration, Bureau of the Census : For sale by Supt. of Docs., U.S. G.P.O., [1993]
[Washington, D.C.] : United States Environmental Protection Agency, Office of Water, Office of Science and Technology, Health and Ecological Criteria Division, [2000]
[Washington, D.C.] : United States Environmental Protection Agency, Office of Water, Office of Science and Technology, Health and Ecological Criteria Division, [2000]
[Washington, D.C.] : United States Environmental Protection Agency, Office of Water, Office of Science and Technology, Health and Ecological Criteria Division, [2001]
[Washington, D.C.] : United States Environmental Protection Agency, Office of Water, Office of Science and Technology, Health and Ecological Criteria Division, [2001]