@book{550673,
	author = {United States.},
	title = {Soil survey manual /},
	publisher = {U.S. Dept. of Agriculture :},
	year = {[1993]},
	series = {United States Department of Agriculture handbook ;},
	address = {[Washington, D.C.] :},
	note = {"This is a revision and enlargement of U.S. Department of Agriculture Handbook No. 18, the Soil survey manual, issued October 1962, and supersedes it."}
}