@book{24317,
	author = {Stone, Ralph W.},
	title = {Mineral resources of the Elders ridge quadrangle, Pennsylvania /},
	publisher = {Govt. Print. Off.,},
	year = {1905.},
	series = {U.S. Geological survey. Bulletin},
	address = {Washington,},
	note = {Subject series: A, Economic geology, 51; B, Descriptive geology, 63.}
}