Columbia subject headings:
Harvard subject headings:
Haciendas--Mexico--Yucatán (State)--History.
Henequen industry--Mexico--Yucatán (State)--History.
International Harvester Company--History.
Princeton subject headings:
Haciendas--Mexico--Yucatán--History.
Henequen industry--Mexico--Yucatán--History.
International Harvester Company--History.