District of Columbia. Relations between District of Columbia and Federal governments, Senate report by Mr. Southard, 23d Congress, 2d session, Senate report 493, pt. 1, 43d Congress, 1st session, House report 627. 43d Congress, 1st session, Senate report 479, 43d Congress, 2d session [and] Senate report 572, 44th Congress, 2d session.