| Reference | {Deposit:: RECORDS OF THE CORTEZA TERRESTRE (SURFACE MINING PERMITS OFFICE), PUERTO RICO DEPARTMENT OF NATURAL RESOURCES, 1991.}{Deposit:: MONROE, W.H., 1967, GEOLOGIC MAP OF THE QUEBRADILLAS QUADRANGLE, PUERTO RICO: U.S. GEOLOGICAL SURVEY MISCELLANEOUS GEOLOGIC INVESTIGATIONS MAP I-498, SCALE 1:20,000.} |