@book{27725,
	author = {Butts, Charles, and Geological Survey (U.S.)},
	title = {Geology of the Appalachian valley in Virginia,},
	year = {1940-},
	series = {Virginia. Geological survey. Bulletin},
	address = {University, Va.,},
	note = {At head of title: Commonwealth of Virginia. Virginia Conservation Commission. Virginia Geological survey, Arthur Bevan, state geologist.}
}