| Reference | {Deposit:: FILES OF THE CORTEZA TERRESTRE (SURFACE MINING PERMITS OFFICE), PUERTO RICO DEPARTMENT OF NATURAL RESOURCES, 1991.}{Deposit:: ROGERS, C.L., CRAM, C.M., PEASE, M.H., AND TISCHLER, M.S., 1979, GEOLOGIC MAP OF THE YABUCOA AND PUNTA TUNA QUADRANGLES, PUERTO RICO: U.S. GEOLOGICAL SURVEY MISCELLANEOUS INVESTIGATIONS MAP I-1086, SCALE 1:20,000.} |