@book{26902,
	author = {Bascom, F.},
	title = {Geology and mineral resources of the Quakertown-Doylestown district, Pennsylvania and New Jersey /},
	publisher = {U.S. G.P.O.,},
	year = {1931.},
	series = {Bulletin ;},
	address = {Washington :},
	note = {Col. map on folded leaf in pocket.}
}