Reservoirs, air space, administrative improvements, charitable trusts, and incorporation of professional individuals : hearing before the Subcommittee on Business, Commerce, and Judiciary of the Committee on the District of Columbia, United States Senate, Ninety-second Congress, first session on S. 1362, pay district's portions of reservoirs costs : S. 1367, freeway airspace utilization : S. 2204, District of Columbia administrative improvements : S. 2409, charitable and split interest trusts amendments : H.R. 10383, proposed District of Columbia Professional Corporation Act, October 28, 1971.