APA (7th ed.) Citation

Geological Survey (U.S.) & Koplin, D. (1997). Agricultural chemicals in Iowa's ground water, 1982-95-- what are the trends. U.S. Dept. of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and Dana Koplin. Agricultural Chemicals in Iowa's Ground Water, 1982-95-- What Are the Trends. [Reston, Va.]: U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

MLA (9th ed.) Citation

Geological Survey (U.S.) and Dana Koplin. Agricultural Chemicals in Iowa's Ground Water, 1982-95-- What Are the Trends. U.S. Dept. of the Interior, U.S. Geological Survey, 1997.