Columbia subject headings:
Harvard subject headings:
Rhinoceroses--Conservation--Law and legislation--United States.
Rhinoceroses--Law and legislation--United States.
Tiger--Conservation--Law and legislation--United States.
Tiger--Law and legislation--United States.
Wildlife conservation--Law and legislation--United States
Princeton subject headings:
Rhinoceroses--Law and legislation--United States.
Tiger--Law and legislation--United States.
Wildlife conservation--Law and legislation--United States.