@book{26950,
	author = {Mansfield, George Rogers, and Boardman, Leona,},
	title = {Nitrate deposits of the United States,},
	publisher = {U.S. Govt. Print. Off.,},
	year = {1932.},
	series = {U.S. Geological survey. Bulletin 838},
	address = {Washington,},
	note = {At head of title: United States Department of the Interior. Ray Lyman Wilbur, secretary, Geological survey. W.C. Mendenhall director.}
}