Columbia subject headings:
Radio--Law and legislation--United States.
Telecommunication--Law and legislation--United States.
Telecommunication--United States.
Telegraph, Wireless--Law and legislation.
Telegraph, Wireless.
Harvard subject headings:
Radio--Law and legislation--United States
Telegraph, Wireless--Law and legislation.
Telegraph, Wireless.
Princeton subject headings:
Radio--Law and legislation--United States.
Telegraph, Wireless--Law and legislation.
Telegraph, Wireless.