Columbia subject headings:
Biosphere reserves--United States.
Natural resources conservation areas--United States.
U.S. National Committee for Man and the Biosphere.
Harvard subject headings:
Biosphere reserves--United States.
Natural resources conservation areas--United States.
U.S. National Committee for Man and the Biosphere.
Princeton subject headings:
Biosphere reserves--United States.
Natural resources conservation areas--United States.
U.S. National Committee for Man and the Biosphere.