	*Roberts, Willard Lincoln, Rapp, George Jr. (1965) Mineralogy of the Black Hills. Bulletin* 18. South Dakota School of Mines and Technology**	Report (issue)
	STATE OF SOUTH DAKOTA Nils Boe, Governor MINERALOGY OF THE BLACK HILLS by WILLARD LINCOLN ROBERTS...Associate in Mineralogy Museum of Geology, South Dakota School of Mines and Technology and GEORGE RAPP...Department of Geology and Geological Engineering, South Dakota School of Mines and Technology With the Editorial...Mineralogy South Dakota School of Mines and Technology BULLETIN NUMBER 18 of the South Dakota School of...of Mines and Technology Rapid City, South Dakota PUBLICATIONS STAFF F. L. Partlo J. T. Thomas President
	*(1953) Geology and pegmatites of part of the Fourmile area, Custer County, South Dakota. Circular* 245. US Geological Survey doi:10.3133/cir245**	Report (issue)
	PEGMATITES OF PART OF THE FOURMILE AREA CUSTER COUNTY SOUTH DAKOTA By Andrew J. Lang, Jr. and Jack A. Redden...PEGMATITES OF PART OF THE FOURMILE AREA CUSTER COUNTY, SOUTH DAKOTA By Andrew J. Lang, Jr. and Jack A. Redden............... Placer deposits................... Lode deposits .................... Mines and prospects...Economic minerals .............. Pegmatite 57 (Silver Top lode mine)..... Plagioclase-quartz-perthite pegmatite...Economic minerals .............. Pegmatite 67 (Dorothy lode mine) ....... Plagioclase-quartz-muscovite pegmatite

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Diopside from Silver Top lode, Custer Mining District, Custer County, South Dakota, USA