Columbia subject headings:
Harvard subject headings:
Cárdenas, Lázaro, 1895-1970.
Mexico--Foreign economic relations.
Mexico--Politics and government--1910-1946.
Petroleum industry and trade--Government ownership--Mexico--History.
Princeton subject headings:
Cárdenas, Lázaro, 1895-1970.
Mexico--Politics and government--1910-1946.
Presidents--Mexico--Biography.