| Reference | {Deposit:: NOBLE, W.D., 1932, INVESTIGATIONS OF MINERAL RESOURCS OF PORTO RICO: MINING COMMISSION PRIVATE REPORT ON FILE AT THE DEPARTMENT OF NAUTRAL RESOURCES, PUERTO RICO.}{Deposit:: U.S.BUREAU OF MINES, 1936, THE MINERAL RESORUCES OF PUERTO RICO: UNPUBLISHED REPORT ON FILE AT THE DEPARTMENT OF NATURAL RESOURCES, PUERTO RICO.} |