| 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:: PUERTO RICO BUREAU OF MINES,1941, REPORT OF THE BUREAU OF MINES ON THE MINERAL RESOURCES OF PUERTO RICO, AN APPENDIX TO THE ANNUAL REPORT OF THE BUREAU OF MINES FOR THE FISCAL YEARS 1939-1941: SAN JUAN, BUR. SUPPLIES, PRINTING, AND TRANSPORTATION, 52 P.} |