Columbia subject headings:
Endangered species--Law and legislation--United States.
Habitat conservation--Law and legislation--United States.
Wildlife conservation--Law and legislation--United States.
Harvard subject headings:
Endangered species--Law and legislation--United States
Habitat conservation--Law and legislation--United States.
Wildlife conservation--Law and legislation--United States
Princeton subject headings:
Endangered species--Law and legislation--United States.
Habitat conservation--Law and legislation--United States.
Wildlife conservation--Law and legislation--United States.