Working Conditions and Postal Construction Program -- U.S. Postal Service, Hearings Before the Subcommittee on Post Office and Civil Service ..., 92-1 and 2, July 21, 28, September 22, October 28, November 9, December 7, 8, 9, 1971; March 1, 8, 9, June 14, September 13, 26, 27, 28, October 4, 1972