@book{145517,
	author = {Foley, N. K.},
	title = {Mineralogy, mineral chemistry, and paragenesis of gold, silver, and base-metal ores of the North Amethyst vein system, San Juan Mountains, Mineral County, Colorado},
	publisher = {U.S. G.P.O.},
	year = {1993.},
	series = {U.S. Geological Survey professional paper},
	address = {Washington}
}