| Reference | {Deposit:: FILES OF THE CORTEZA TERRESTRE (SURFACE MINING PERMITS OFFICE), PUERTO RICO DEPARTMENT OF NATURAL RESOURCES, 1991.}{Deposit:: VOLCKMANN, R.P., 1984, GEOLOGIC MAP OF THE PUERTO REAL QUADRANGLE, SOUTHWEST PUERTO RICO: U.S. GEOLOGICAL SURVEY MISCELLANEOUS INVESTIGATIONS SERIES MAP I-1559, SCALE 1:20,000.} |