Columbia subject headings:
Harvard subject headings:
Invasive plants--Control--Law and legislation--United States.
Plants, Protection of--Law and legislation--United States.
United States. Animal and Plant Health Inspection Service
Weeds--Control--Law and legislation--United States.
Princeton subject headings:
Invasive plants--Control--Law and legislation--United States.
Plants, Protection of--Law and legislation--United States.
United States. Animal and Plant Health Inspection Service
Weeds--Control--Law and legislation--United States.