@book{24519,
	author = {O'Harra, Cleophas C.},
	title = {The mineral wealth of the Black Hills.},
	year = {1902.},
	series = {South Dakota School of Mines. Bulletin no. 6. Department of geology},
	address = {Rapid City, S.D.,},
	note = {"Published also as a part of Bulletin no. 3 of the South Dakota Geological Survey."}
}