Rare Earth Occurrence

MINISTERIO DE MINAS E HIDROCARBUROS, 1959, MAPA GEOLOGICO Y DE RECURSOS MINERALES DEL ESTADO BOLIVAR: REPUBLICA DE VENEZUELA MINISTERIO DE MINAS E HIDROCARBUROS, ESCALA 1:1,000,000.STAUDE, JOHN-MARK G., 1989, A PRILIMINARY MAP AND STUDY OF MINERAL DEPOSITS IN VENEZUELA: CAMBRIDGE, MASS., HARVARD UNIVERSITY, DEPARTMENT OF GEOLOGY, AN UNPUBLISHED REPORT, 24 P.CIMRI