@book{25035,
	author = {Marshall, R. B.},
	title = {Results of spirit leveling in Iowa 1896 to 1909, inclusive. /},
	publisher = {Govt. Print. Off.,},
	year = {1911.},
	series = {U.S. Geological survey. Bulletin 460},
	address = {Washington,},
	note = {Issued also as House doc. no. 1433, 61st Cong., 3d sess.}
}