@book{30083,
	author = {Agnew, Allen F., and Tychsen, Paul C.},
	title = {A Guide to the stratigraphy of South Dakota /},
	publisher = {Science Center, University of South Dakota,},
	year = {1965.},
	series = {Bulletin / South Dakota Geological Survey ;},
	address = {Vermillion, S.D. :}
}