Columbia subject headings:
DDT (Insecticide)--Environmental aspects--United States--History.
Pesticides--Government policy--United States--History.
Harvard subject headings:
DDT (Insecticide)--Environmental aspects--United States--History.
Pesticides--Government policy--United States--History.
Princeton subject headings:
DDT (Insecticide)--Environmental aspects--United States--History.
Pesticides--Government policy--United States--History.