| Reference | {Deposit:: FILES OF THE CORTEZA TERRESTRE (SURFACE MINING PERMITS OFFICE), PUERTO RICO DEPARTMENT OF NATURAL RESOURCES, 1991.}{Deposit:: KRUSHENSKY, R.D., AND MONROE, W.H., 1978, GEOLOGIC MAP OF THE PENUELAS AND PUNTA CUCHARA QUADRANGLES, PUERTO RICO: U.S. GEOLOGICAL SURVEY MISCELLANEOUS INVESTIGATIONS SERIES MAP I-1042, SCALE 1:20,000.} |