Biological associated problems in freshwater environments: their identification, investigation and c

Mackenthun, Kenneth Marsh, 1919-
Washington : U.S. Dept. of the Interior, Federal Water Pollution Control Administration; for sale by the Supt. of Docs., U.S. Govt. Print. Off., [1967]

The practice of water pollution biology

Mackenthun, Kenneth Marsh, 1919-
[Washington] : U.S. Federal Water Pollution Control Administration, Division of Technical Support; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1969.

The practice of water pollution biology

Mackenthun, Kenneth Marsh, 1919-
[Washington] : U.S. Federal Water Pollution Control Administration, Division of Technical Support; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1969.