Columbia subject headings:
Ecology--Periodicals.
Environmental protection--Periodicals.
Human ecology--Periodicals.
Industries--Environmental aspects--Periodicals.
Nature--Effect of human beings on--Periodicals.
Pollution--Periodicals.
Harvard subject headings:
Ecology--Periodicals
Environmental protection--Periodicals
Human ecology--Periodicals
Industries--Environmental aspects--Periodicals.
Nature--Effect of human beings on--Periodicals
Pollution--Periodicals
Princeton subject headings:
Ecology--Periodicals.
Nature--Effect of human beings on--Periodicals.
Periodicals.