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MLA

Nielsen, Elizabeth G, et al. "The Magnitude and Costs of Groundwater Contamination From Agricultural Chemicals : a National Perspective." , 38. Print

APA

Nielsen, E. G, Lee, L. K. (Linda Kay), United States, U. States, Department of Agriculture, D. of Agriculture, & Economic Research Service, E. Research Service. (1987). The magnitude and costs of groundwater contamination from agricultural chemicals : a national perspective.

Chicago

Nielsen, Elizabeth G., Linda K. (Linda Kay) Lee, United States, Department of Agriculture, and Economic Research Service. "The magnitude and costs of groundwater contamination from agricultural chemicals : a national perspective" (0000): 38.