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Two new manuals describing standard techniques for water quality analysis work ‘reflect the nation's growing concern over our many manmade pollutants and their effects on both aquatic life and man himself,’ according to R. J. Pickering of USGS. The manuals reflect the changing needs in water quality analysis, covering such subjects as sampling and measuring radioactive substances and aquatic life in surface and underground water and sediments.

The latest in the 34-volume series Techniques of Water Resources Investigations, the two volumes are the first in a new loose-leaf format designed for speedy updating. Because of the new format and the automatic distribution of future supplements and revisions, the two new manuals are available only from the Superintendent of Documents.