Reference | {Deposit:: FILES OF THE CORTEZA TERRESTRE (SURFACE MINING PERMITS OFFICE), PUERTO RICO DEPARTMENT OF NATURAL RESOURCES, 1991.}{Deposit:: SEIDERS, V.M., 1971, GEOLOGIC MAP OF THE GURABO QUADRANGLE, PUERTO RICO: U.S. GEOLOGICAL SURVEY MISCELLANEOUS INVESTIGATIONS MAP I-567, SCALE 1:20,000.} |