@book{30057,
	author = {Willrich, Ted L., and Iowa State University.},
	title = {Agricultural practices and water quality.},
	publisher = {Iowa State University Press},
	year = {[1971, c1970]},
	address = {Ames,},
	edition = {[1st ed.]},
	note = {"Result of a conference, The role of agriculture in clean water, held at Iowa State University, Ames, Iowa, November 18-20, 1969."}
}