Geology of the Hugo pegmatite Keystone, South Dakota : pegmatites and other precambrian rocks in the southern Black Hills - Norton, James J. (James Jennings), 1918-2005; Page, Lincoln R. (Lincoln Ridler), 1910-1996; Brobst, Donald A. (Donald Albert), 1925-2011 (Washington : United States Government Printing Office, 1962)
Keywords: pegmatity; strukturní geologie; pegmatites; structural geology; Jižní Dakota; South Dakota; studie; studies