Report Delivered by the Director General of Petróleos Mexicanos, Ing. Jorge Díaz Serrano, Before the President of Mexico, Lic. José López Portillo, on the Commemoration of the Fourtieth Anniversary of the Nationalization of the Petroleum Industry at Poza Rica, Ver., on March 18, 1978
Report Delivered by the Director General of Petróleos Mexicanos, Ing. Jorge Díaz Serrano, Before the President of Mexico, Lic. José López Portillo, on the Commemoration of the Fourty-first [i.e. Forty- First] Anniversary of the Nationalization of the Petroleum Industry, at Cadereyta, N.L., on March 18, 1979
Report Delivered by the Director General of Petróleos Mexicanos, Ing. Jorge Díaz Serrano, Before the President of Mexico, Lic. José López Portillo, on the Commemoration of the Fourty-second [sic] Anniversary of the Nationalization of the Petroleum Industry at Guadalajara, Jal. on March 18, 1980