@book{28058,
	author = {Petsch, Bruno Carl,},
	title = {Geology of the Missouri Valley in South Dakota,},
	publisher = {University of South Dakota,},
	year = {1946.},
	series = {South Dakota. State Geologist. Report of investigations,},
	address = {Vermillion, S.D.,},
	note = {At head of title: State of South Dakota ... State Geological Survey ...}
}