Contrato Caucheros Provincia de "El Oro"
in Records of the Office of Inter-American Affairs, 1918 - 1951 (RG229). General Records of the El Oro Technical Mission, 1942 - 1944 (I-7 152), of United States. National Archives and Records Administration. Federal Records (1943), Box 1709, I ac) Reports, Marcabeli District , 1 page(s)