Attempted merger of Puget Sound Power and Light Co. and the Washington Water Power Co. : a study of the antitrust laws / staff report of the Subcommittee on Antitrust and Monopoly of the Committee on the Judiciary, United States Senate, Eighty-fourth Congress, second session, pursuant to S. Res. 170 to study the antitrust laws of the United States, and their administration, interpretation, and effect