@book{27006,
	author = {Stose, George Willis, and Pennsylvania.},
	title = {Geology and mineral resources of the Middletown quadrangle, Pennsylvania,},
	publisher = {U.S. Govt. Print Off.,},
	year = {1933.},
	series = {U.S. Geological survey. Bulletin 840},
	address = {Washington,},
	note = {At head of title: United States Department of the Interior.}
}