Columbia subject headings:
Electronic commerce--Taxation--Law and legislation--United States.
Internet service providers--Law and legislation--United States.
Long distance telephone service--Access charges--United States.
Harvard subject headings:
Electronic commerce--Taxation--Law and legislation--United States.
Internet service providers--Law and legislation--United States.
Long distance telephone service--Access charges--United States.
Princeton subject headings:
Electronic commerce--Taxation--Law and legislation--United States.
Internet service providers--Law and legislation--United States.
Long distance telephone service--Access charges--United States.