@book{190703,
	author = {Clark, Melanie L. and Mast, M. Alisa.},
	title = {Environmental characteristics and water quality of hydrologic benchmark network stations in the west-central United States, 1963-95},
	publisher = {U.S. Dept. of the Interior, U.S. Geological Survey},
	year = {2000.},
	series = {USGS circular},
	address = {Reston, Va.}
}