@book{27961,
	author = {Gwynne, Charles Sumner,},
	title = {Pegmatites in the Beecher Rock basin,},
	publisher = {University of South Dakota,},
	year = {1944.},
	series = {South Dakota Geological Survey. Report of investigations,},
	address = {Vermillion, S.D.,},
	note = {At head of title: State of South Dakota, M. Q. Sharpe, Governor. State Geological Survey, E. P. Rothrock, State Geologist.}
}