TY - MANSCPT DB - Science History Institute DP - Science History Institute M2 - Courtesy of Science History Institute. Rights: In Copyright TI - Mexican postage stamp celebrating the Congreso Mundial del Petróleo ID - 8la97ic AU - Mexico. Dirección General de Talleres de Impresión de Estampillas y Valores DA - 1967/// YR - 1967 AV - Witco Stamp Collection, Box 5 VL - Witco Stamp Collection, Box 5 AN - Witco Stamp Collection, Box 5 UR - https://digital.sciencehistory.org/works/8la97ic AB - Mexican postage stamp celebrating the 7th World Petroleum Congress, which was held in Mexico City from April 2-9, 1967. The stamp features an illustrated depiction of an oil refinery. KW - Commemorative postage stamps KW - Mexico KW - Postage stamps KW - Science on postage stamps KW - World Petroleum Congress KW - Petroleum industry and trade LA - Spanish ER -