Doyle, Frank J.
Washington : Office of Research and Development, U.S. Environmental Protection Agency; for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1974.
Pidot, George Bernard.
Washington : Office of Research and Development, U.S. Environmental Protection Agency; for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1974.