Columbia subject headings:
Ecology--Mexico--Statistics.
Gross national product--Mexico--Statistics.
Mexico--Economic conditions--1994---Statistics.
Mexico--Environmental conditions--Statistics.
Natural resources--Mexico--Statistics.
Harvard subject headings:
Ecology--Mexico--Statistics.
Gross national product--Mexico--Statistics.
Mexico--Economic conditions--1994---Statistics.
Mexico--Environmental conditions--Statistics.
Natural resources--Mexico--Statistics.
Princeton subject headings:
Ecology--Mexico--Statistics.
Gross national product--Mexico--Statistics.
Mexico--Economic conditions--1994---Statistics.
Mexico--Environmental conditions--Statistics.
Natural resources--Mexico--Statistics.