Annual summary of water quality data for selected sites in the Pacific Northwest
Subtitle: October 1970 to September 1971
By: released by U.S. Geological Survey Northwest Water Resources Data Center.
Publisher: U.S. Geological Survey, Northwest Water Resources Data Center
Published: 1971
Place of publication: Portland, Or.?
Language: eng
Number of pages: 43
Subjects: Water quality -- Northwest, Pacific -- Statistics.
Genres: Statistics.