Paz De Rio

PRINZ, W., 1971, STATUS OF INVESTIGATIONS OF SEVERAL IRON DEIN C. COLOMBIA: USGS PROJECT RPT. IR CO-19 FOR AID, MAR., 71SINGEWALD, Q., 1949, MINERAL RESOURCES OF COLOMBIA: USGS B.204 PGS.VAN HOUTEN, F., 1967, CENOZOIC OOLITIC IRON ORE, PAZ DE RIO,COLOMBIA: ECON. GEOL., VOL. 62, PP. 992-999.WOKITTEL, R., 1968, COLOMBIA IN LATIN AMERICAN MINING: SERV.NAC., BOL. GEOL., VOL. 16, NO. 1-3, PP. 113-160, IN SPANISH.AME MINERAL ECONOMICS QUARTERLY MINE ANALYSIS, JUN 93,P. 36.