U.S. Dept. of the Interior, Federal Water Pollution Control Administration : For sale by the Supt. of Docs., U.S. G.P.O.,

[Environmental Protection Agency, Water Quality Office]; for sale by the Supt. of Docs., U.S. Govt. Print. Off.,

Environmental Protection Agency, Water Quality Office]; for sale by the Supt. of Docs., U.S. Govt. Print. Off.,

Metropolitan Water District of Southern California ; EPA,

The Dept.,

For sale by the Supt. of Docs., U.S. G.P.O.,

For sale by the Supt. of Docs., U.S. G.P.O.,

For sale by the Supt. of Docs., U.S. Govt. Print. Off.,

U.S. Govt. Print. Off.,

U.S. Environmental Protection Agency; for sale by the Supt. of Docs., U.S. Govt. Print. Off.],

[Environmental Protection Agency, Research and Monitoring]; for sale by the Supt. of Docs., U.S. Govt. Print. Off.,

s.l.,