Columbia subject headings:
Income tax--Law and legislation--United States--States.
Public utilities--Taxation--Law and legislation--United States--States.
Harvard subject headings:
Electric utilities--Taxation--United States--States.
Income tax--Law and legislation--United States--States.
Natural gas--Taxation--United States--States.
Public utilities--Taxation--Law and legislation--United States--States.
Public utilities--Taxation--United States--States.
Princeton subject headings: