@book{30524,
	author = {Cobban, William Aubrey,},
	title = {The late Cretaceous ammonites Scaphites leei Reeside and Scaphites hippocrepis (DeKay) in the western interior of the United States,},
	publisher = {U.S. Govt. Print. Off.,},
	year = {1969.},
	series = {Geological Survey professional paper 619},
	address = {Washington,}
}