Nitrate occurrence in U.S. waters (and related questions) :
a reference summary of published sources from an agricultural perspective /
prepared by John Fedkiw.

APA Citation

Fedkiw, J., United States. Dept. of Agriculture. (1991). Nitrate occurrence in U.S. waters (and related questions): a reference summary of published sources from an agricultural perspective. Washington, D.C.: U.S. Dept. of Agriculture.

MLA Citation

Fedkiw, John, and United States. Dept. of Agriculture. Nitrate Occurrence In U.S. Waters (and Related Questions): a Reference Summary of Published Sources From an Agricultural Perspective. Washington, D.C.: U.S. Dept. of Agriculture, 1991.

Warning: These citations may not always be complete (especially for serials).