@book{27349,
	author = {Staack, J. G.},
	title = {Spirit leveling in Massachusetts, 1922-35},
	publisher = {U.S. Govt. print. off.,},
	year = {1937.},
	series = {U. S. Geological survey. Bulletin 882},
	address = {Washington,},
	note = {At head of title: United States Department of the interior.}
}