Obscenity in the mail : hearings before the Subcommittee on Postal Operations of the Committee on Post Office and Civil Service, House of Representatives, Ninety-first Congress, second session : hearing on the report of the President's Commission on Obscenity and Pornography, and on H.R. 19541, a bill to amend Title 39, United States Code, to improve the protection of a person's right of privacy by defining obscene mail matter, and for other purposes, August 11, November 17 and 18, 1970.