Columbia subject headings:
Biosphere--Periodicals.
Ecology--Periodicals.
Environmental policy--United States--Periodicals.
U.S. National Committee for Man and the Biosphere--Periodicals.
Harvard subject headings:
Biosphere--Periodicals.
Ecology--Periodicals
Environmental policy--United States--Periodicals
U.S. National Committee for Man and the Biosphere--Periodicals.
Princeton subject headings: