@book{27057,
	author = {Pardee, Joseph Thomas, and Schrader, Frank Charles,},
	title = {Metalliferous deposits of the greater Helena mining region, Montana,},
	publisher = {U.S. Govt. Print. Off.,},
	year = {1933.},
	series = {U.S. Geological survey. Bulletin 842},
	address = {Washington,}
}