Plastic Jungle : hearings before the United States House Committee on Post Office and Civil Service, Subcommittee on Postal Operations, Ninety-First Congress, first session and Ninety-First Congress, second session, on Oct. 29, Nov. 19, 1969; Jan. 28, Feb. 4, 1970.

Committee Serial No. 91-20. Considers H.R. 13244 and H.R. 14346 and similar bills, to require all mailed credit cards be sent by certified mail with liability and contract notices, and to ban the mailing of all unrequested credit cards.