@book{286050,
	title = {Digital mapping techniques '06--workshop proceedings, June11--14, 2006 Columbus, Ohio.},
	publisher = {U.S. Dept. of the Interior, U.S. Geological Survey.},
	year = {2007.},
	series = {U.S. Geological Survey open-file report},
	address = {Washington, D.C. :},
	note = {"Association of American State Geologists and the United States Geological Survey."}
}