@book{145495,
	author = {Mandle, Richard J. and Kontis, A. L.},
	title = {Simulation of regional ground-water flow in the Cambrian-Ordovician aquifer system in the northern Midwest, United States},
	publisher = {U.S. G.P.O.},
	year = {1992.},
	series = {Regional aquifer-system analysis--northern midwest},
	address = {Washington}
}