Reference | {Deposit:: CONFIDENTIAL UNPUBLISHED WAR MINERAL REPTS, SPINGFIELD MINE,}{Deposit:: OLL, CO., MD., BU MINES, 1942., MISC. REPTS.}{Deposit:: ESPENSHADE, GILBERT K., REPT. ON MD COPPER MINES AND PROSPEC}{Deposit:: USGS UNPUBLISHED CONFID. REPT, AUG 13, 1942}{Deposit:: HEYL, ALLEN V., AND PEARRE, NANCY C., MD GEOL.SUR. BULL 28,} |