Mandatory certification program for wastewater treatment plant operators in the State of Washington
By: Dept. of Ecology.
Publisher: The Department
Published: 1974
Place of publication: [Olympia]
Language: eng
Number of pages: 65
Subjects: Sewage -- Purification -- Washington (State) -- Directories; Sewage disposal plants -- Washington (State) -- Directories
Notes: Consists chiefly of a directory of plant operators in Washington State.

"TR 74-017."