@book{145533,
	author = {Jorgensen, Donald G. and Helgesen, John O.},
	title = {Regional aquifers in Kansas, Nebraska, and parts of Arkansas, Colorado, Missouri, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming--geohydrologic framework},
	publisher = {U.S. G.P.O.},
	year = {1993.},
	series = {Regional aquifer-system analysis--Central Midwest},
	address = {Washington},
	note = {Issued in a portfolio.}
}