Maps of estimated nitrate and arsenic concentrations for basin-fill aquifers of the Southwestern United States

MLA

Beisner, Kimberly R., Geological Survey (U.S.) and National Water-Quality Assessment Program (U.S.). Maps of estimated nitrate and arsenic concentrations for basin-fill aquifers of the Southwestern United States. Reston, Va. : U.S. Department of the Interior, U.S. Geological Survey, 2012.

APA

Beisner, K., Geological Survey (U.S.) & National Water-Quality Assessment Program (U.S.). (2012). Maps of estimated nitrate and arsenic concentrations for basin-fill aquifers of the Southwestern United States. Reston, Va. : U.S. Department of the Interior, U.S. Geological Survey.

Chicago

Beisner, Kimberly R., Geological Survey (U.S.) and National Water-Quality Assessment Program (U.S.). Maps of estimated nitrate and arsenic concentrations for basin-fill aquifers of the Southwestern United States. Reston, Va. : U.S. Department of the Interior, U.S. Geological Survey, 2012.