Reference | {Deposit:: RECORDS OF THE CORTEZA TERRESTRE (SURFACE MINING PERMITS OFFICE), PUERTO RICO DEPARTMENT OF NATURAL RESOURCES.}{Deposit:: BRIGGS, R.P., 1965, GEOLOGIC MAP OF THE BARCELONETA QUADRANGLE: U.S. GEOLOGICAL SURVEY MISCELLANEOUS GEOLOGIC INVESTIGATIONS MAP I-421, SCALE 1:20,000.} |