@book{26706,
	author = {Knopf, Adolph, and California State Mining Bureau.},
	title = {The Mother Lode system of California,},
	publisher = {U.S. Govt. Print. Off.,},
	year = {1929.},
	series = {United States.  Geological Survey.  Professional paper},
	address = {Washington,},
	note = {At head of title: Department of the Interior.}
}