TY - BOOK ID - 135840157 TI - Exploration for beryllium at the Helen Beryl, Elkhorn, and Tin Mountain pegmatites, Custer County, South Dakota AU - Staatz, Mortimer Hay AU - Geological Survey (U.S.). AU - United States atomic energy commission PY - 1963 PB - Washington (D.C.) US. Government printing office DB - UniCat KW - Beryllium ores KW - -Pegmatites KW - -Mines and mineral resources KW - -Beryllium ores KW - -Mines and mineral resources - UR - https://www.unicat.be/uniCat?func=search&query=sysid:135840157 AB - ER -