@book{27594,
	author = {Willard, Bradford, and Fraser, Donald McCoy,},
	title = {Guidebook to the geology near Reading, Pa.,},
	publisher = {Department of internal affairs, Topographic and geologic survey,},
	year = {1939.},
	address = {Harrisburg, Pa.,},
	note = {At head of title: Pennsylvania Geological Survey, Fourth series.}
}