Columbia subject headings:
Ecology--Data processing--Periodicals.
Ecology--Mathematical models--Periodicals.
Environmental protection--Data processing--Periodicals.
Environmental protection--Mathematical models--Periodicals.
Harvard subject headings:
Ecology--Data processing--Periodicals.
Ecology--Mathematical models--Periodicals.
Environmental protection--Data processing--Periodicals.
Environmental protection--Mathematical models--Periodicals.
Princeton subject headings:
Ecology--Data processing--Periodicals.
Ecology--Mathematical models--Periodicals.
Environmental protection--Data processing--Periodicals.
Environmental protection--Mathematical models--Periodicals.