Columbia subject headings:
Adams, Robert, 1937-
Columbia River Valley--Pictorial works.
Columbia River--Pictorial works.
Landscape photography--Columbia River.
Harvard subject headings:
Adams, Robert, 1937-
Columbia River Estuary (Or. and Wash.)--Pictorial works.
Landscape photography.
Princeton subject headings:
Columbia River Estuary (Or. and Wash.)--Pictorial works.