Columbia subject headings:
Harvard subject headings:
Conservation of natural resources--Law and legislation--West (U.S.)
Endangered species--Law and legislation--United States
Endangered species--Law and legislation--West (U.S.)
Endangered species--Northwest, Pacific.
Northern spotted owl--Conservation--Law and legislation--United States.
Northern spotted owl--Conservation--Northwest, Pacific.
Spotted owl--Law and legislation--West (U.S.)
Princeton subject headings:
Conservation of natural resources--Law and legislation--West (U.S.).
Endangered species--Law and legislation--West (U.S.).
Spotted owl--Law and legislation--West (U.S.).