Columbia subject headings:
Harvard subject headings:
Endangered species--Law and legislation--United States
Habitat (Ecology)--Modification--United States.
Habitat conservation--Law and legislation--United States.
Wildlife conservation--Law and legislation--United States
Wildlife habitat improvement--United States.
Princeton subject headings:
Endangered species--Law and legislation--United States.
Habitat (Ecology)--Modification--United States.
Habitat conservation--United States.
Wildlife conservation--Law and legislation--United States.
Wildlife habitat improvement--United States.