Columbia subject headings:
Electric utilities--Law and legislation--United States.
Electric utilities--United States.
Gas companies--United States.
Holding companies.
Power resources--Law and legislation--United States.
Public utilities--United States.
Public utility holding companies--Law and legislation--United States.
Public utility holding companies--United States.
United States. Public Utility Holding Company Act of 1935.
Harvard subject headings:
Holding companies.
Public utilities--United States.
Princeton subject headings:
Holding companies.
Public utilities--United States.