Columbia subject headings:
Ecology--Bibliography.
Human ecology--Bibliography.
Natural resources--Bibliography.
Nature conservation--Bibliography.
Nature--Effect of human beings on--Bibliography.
Harvard subject headings:
Ecology--Bibliography
Human ecology--Bibliography
Natural resources--Bibliography
Nature conservation--Bibliography.
Nature--Effect of human beings on--Bibliography.
Princeton subject headings:
Ecology--Bibliography.
Human ecology--Bibliography.
Natural resources--Bibliography.
Nature conservation--Bibliography.
Nature--Effect of human beings on--Bibliography.