@book{24620,
	author = {Hunt, Thomas Sterry,},
	title = {Special report on the trap dykes and Azoic rocks of southeastern Pennsylvania.},
	publisher = {Pub. by the Board of commissioners for the Second geological survey,},
	year = {1878.},
	series = {Pennsylvania. Geological survey, 2d. [Report of progress},
	address = {Harrisburg,},
	note = {At head of title: Second geological survey of Pennsylvania: 1875.}
}