@book{26767,
	author = {Simpson, Howard E. and Riffenburg, Harry Buchholz, and North Dakota Geological Survey},
	title = {Geology and ground-water resources of North Dakota,},
	publisher = {U.S. Govt. print. off.,},
	year = {1929.},
	series = {Geological Survey (U.S.). Water-supply paper},
	address = {Washington,},
	note = {At head of title: United States Department of the Interior.}
}