| Reference | {Deposit:: FILES OF THE CORTEZA TERRESTRE (SURFACE MINING PERMITS OFFICE), PUERTO RICO DEPARTMENT OF NATURAL RESOURCES, 1991.}{Deposit:: MONROE, W.H., 1963, GEOLOGY OF THE VEGA ALTA QUADRANGLE, PUERTO RICO: U.S. GEOLOGICAL SURVEY GEOLOGIC QUADRANGLE MAP GQ-191, SCALE 1:20,000.} |