@book{24623,
	author = {Carll, John F. and Randall, F. A.},
	title = {Report of progress in the Venango county district /},
	publisher = {Published by the Board of Commissioners for the Second Geological Survey,},
	year = {1875.},
	series = {Report of Progress / Geological Survey of Pennsylvania ;},
	address = {Harrisburg :},
	note = {Includes index.}
}