@book{148760,
	author = {Hoffman, J. D. and Buttleman, Kim. and Geological Survey (U.S.)  },
	title = {National geochemical data base},
	publisher = {U.S. Geological Survey},
	year = {1994.},
	series = {U.S. Geological Survey digital data series},
	address = {[Reston, Va.]},
	note = {Title from disc label.}
}