| Reference | {Deposit:: COX, DENNIS P., AND BRIGGS, REGINALD P., 1973, METALLOGENIC MAP OF PUERTO RICO: U.S. GEOLOGICAL SURVEY, MISCELLANEOUS GEOLOGIC INVESTIGATIONS MAP I-721, ACCOMPANIED BY EXPLANATORY PAMPHLET, 6 P.}{Deposit:: LUDDEN, R.B., 196X, REPORT ON GEOLOGIC RECONNAISSANCE IN THE NAGUABO-HUMACAAO PERMIT AREA; BY SHOWLOW MINING CORP, IN DEPT. OF NATURAL RESOURCES,PUERTO RICO.}{Deposit:: FETTKE, C. R., 1924, MAGNETITE DEPOSITS OF EASTERN PORTO RICO: AM. INST. MINING METALL. ENG. TRANS., V. 70, P. 1024-1042.} |