APA (7th ed.) Citation

Ruhl, J. F. (1997). Nitrate and pesticides in surficial aquifers and trophic state and phosophorus sources for selected lakes, eastern Otter Tail County, west-central Minnesota, 1993-96. United States. Dept. of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Ruhl, J. F. Nitrate and Pesticides in Surficial Aquifers and Trophic State and Phosophorus Sources for Selected Lakes, Eastern Otter Tail County, West-central Minnesota, 1993-96. Mounds View, Minn.: United States. Dept. of the Interior, U.S. Geological Survey, 1997.

MLA (9th ed.) Citation

Ruhl, J. F. Nitrate and Pesticides in Surficial Aquifers and Trophic State and Phosophorus Sources for Selected Lakes, Eastern Otter Tail County, West-central Minnesota, 1993-96. United States. Dept. of the Interior, U.S. Geological Survey, 1997.