@book{163061,
	author = {Westjohn, D. B. and Weaver, T. L.},
	title = {Hydrogeologic framework of the Michigan basin regional aquifer system},
	publisher = {U.S. G.P.O.},
	year = {1998.},
	series = {Regional aquifer-system analysis--Michigan Basin aquifer system},
	address = {Washington, DC}
}