Columbia subject headings:
Agricultural innovations--Mexico--History.
Agriculture and state--Mexico--History--20th century.
Agriculture--Economic aspects--Mexico--History--20th century.
Harvard subject headings:
Agricultural innovations--Mexico--History.
Agriculture and state--Mexico--History--20th century.
Agriculture--Economic aspects--Mexico--History--20th century.
Princeton subject headings:
Agricultural industries--Mexico.
Agriculture and state--Mexico.
Agriculture--Economic aspects--Mexico.
Agriculture--Mexico--Technology transfer.