| 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:: BERGEY, W.R., AND HAWLEY, R.G., 1958, REPORTS ON THE LAS TORRES AREA, CAGUAS CONCESSION, PUERTO RICO: A.D. FRASER PRIVATE REPORT ON FILE AT THE DEPARTMENT OF NATURAL RESOURCES, PUERTO RICO.}{Deposit:: VAZQUEZ, LEOVIGILDO, 1960, GEOLOGY AND ORE DEPOSITS OF THE KEYSTONE IRON MINE NEAR JUNCOS, PUERTO RICO, DEPT. OF INDUSTRIAL RESEARCH, ECONOMIC DEVELOPMENT ADMINISTRATION, BULL 7.}{Deposit:: KNOERR, A. W., 1952, MINNESOTA MINING MEN OPEN UP RICH PUERTO RICO IRON MINE: ENG. MINING JOUR., V. 153, NO. 8, P. 74-79.} |