@book{24463,
	author = {Gannett, Samuel S. and Baldwin, David Henry,},
	title = {Results of spirit leveling in Pennsylvania for the years 1899 to 1905 inclusive /},
	publisher = {Govt. Print. Off.,},
	year = {1906.},
	series = {U.S. Geological survey. Bulletin},
	address = {Washington,},
	note = {Subject series: F, Geography, 50.}
}