Columbia subject headings:
Copyright--United States.
Lotteries--Law and legislation--United States.
Periodicals--Publishing--Law and legislation--United States.
Postal service--Law and legislation--United States.
Harvard subject headings:
Copyright--United States.
Lotteries--Law and legislation--United States.
Periodicals--Publishing--Law and legislation--United States.
Postal service--Law and legislation--United States
Princeton subject headings: