@book{25669,
	author = {Trowbridge, Arthur C. and Shaw, Eugene Wesley,},
	title = {Geology and geography of the Galena and Elizabeth quadrangles,},
	publisher = {Illinois State Geological Survey, University of Illinois,},
	year = {1916.},
	series = {Illinois. State Geological Survey. Bulletin,},
	address = {Urbana,}
}