@book{238231,
	author = {Robertson, David, and ebrary, Inc.},
	title = {Hard as the rock itself},
	publisher = {University Press of Colorado,},
	year = {2010, c2006.},
	series = {Mining the American West},
	address = {Boulder, Colo. :},
	edition = {1st pbk. ed.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10422886}
}