Columbia subject headings:
Endangered species--Northwest, Pacific.
Old growth forests--Northwest, Pacific.
Spotted owl--Northwest, Pacific.
Wildlife conservation--Northwest, Pacific.
Harvard subject headings:
Endangered species--Northwest, Pacific.
Old growth forests--Northwest, Pacific
Spotted owl--Northwest, Pacific.
Wildlife conservation--Northwest, Pacific.
Princeton subject headings:
Endangered species--Northwest, Pacific.
Old growth forests--Northwest, Pacific.
Spotted owl--Northwest, Pacific.
Wildlife conservation--Northwest, Pacific.