Columbia subject headings:
Conservation of natural resources--Mexico--History.
Ecology--Mexico--History.
Human ecology--Mexico--History.
Natural resources--Mexico--History.
Harvard subject headings:
Conservation of natural resources--Mexico--History.
Ecology--Mexico--History.
Human ecology--Mexico--History.
Natural resources--Mexico--History.
Princeton subject headings:
Conservation of natural resources--Mexico--History.
Ecology--Mexico--History.
Human ecology--Mexico--History.
Nature--Effect of human beings on--Mexico--History.
Pollution--Environmental aspects--Mexico--History.