Columbia subject headings:
Petroleum industry and trade--Mexico.
Standard Oil Company. Present status of the Mexican oil "expropriations," 1940.
Harvard subject headings:
Petroleum industry and trade--Mexico
Standard Oil Company. Present status of the Mexican oil expropriations, 1940.
Princeton subject headings:
Petroleum industry and trade--Mexico.
Standard Oil Company. Present status of the Mexican oil expropriations, 1940.