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 SAN GERMAN QUADRANGLE, SOUTHWESTERN PUERTO RICO: U.S. GEOLOGICAL SURVEY MISCELLANEOUS INVESTIGATIONS MAP I-558, SCALE 1:20,000.} |