Columbia subject headings:
Harvard subject headings:
Columbia River--Recreational use.
Columbia River.
Conservation of natural resources--Law and legislation--Washington (State)
Recreation areas--Law and legislation--United States.
Wild and scenic rivers--Law and legislation--United States.
Wild and scenic rivers--Law and legislation--Washington (State)
Princeton subject headings:
Columbia River.
Conservation of natural resources--Law and legislation--Washington (State).
Wild and scenic rivers--Law and legislation--Washington (State).