@book{25222,
	author = {Crook, A. R. and YA Pamphlet Collection (Library of Congress)},
	title = {Geology of Sangamon County,},
	publisher = {Illinois State journal co., state printers,},
	year = {1912.},
	address = {Springfield, Ill.,},
	note = {"Literature on Sangamon County geology": p. 24.}
}