Columbia subject headings:
Environmental policy--Periodicals.
Human ecology--Periodicals.
Nature--Effect of human beings on--Periodicals.
Harvard subject headings:
Environmental policy--Periodicals
Human ecology--Periodicals
Nature--Effect of human beings on--Periodicals
Princeton subject headings:
Environmental policy--Periodicals.
Human ecology--Periodicals.
Nature--Effect of human beings on--Periodicals.
Periodicals.