Columbia subject headings:
Nature photography--Exhibitions.
Porter, Eliot, 1901-1990--Exhibitions.
Harvard subject headings:
Nature photography--Exhibitions.
Porter, Eliot, 1901-1990--Exhibitions.
Porter, Eliot, 1901-1990.
Princeton subject headings:
Nature photography--Exhibitions.
Porter, Eliot, 1901-1990--Exhibitions.