%0 Generic %T Manufacture and Sale of Stamped Envelopes hearings before the United States Senate Committee on Post Offices and Post Roads, Seventieth Congress, first session, on Apr. 24, 1928. %U https://ezaccess.libraries.psu.edu/login?url=http://congressional.proquest.com/congcomp/getdoc?HEARING-ID=HRG-1928-PPR-0007