@book{25508,
	author = {Marshall, R. B. and Minnesota.},
	title = {Results of spirit leveling in Minnesota, 1897 to 1914, inclusive /},
	publisher = {Govt. Print. Off.,},
	year = {1915.},
	series = {U.S. Geological survey. Bulletin 560},
	address = {Washington,},
	note = {Includes index.}
}