@book{26948,
	author = {Burbank, W. S. and Henderson, Charles William, and Colorado State Metal Mining Fund.},
	title = {Geology and ore deposits of the Bonanza mining district, Colorado,},
	publisher = {U.S. Govt. Print. Off.,},
	year = {1932.},
	address = {Washington,},
	note = {At head of title: United States Department of the Interior.}
}