Reduced Postal Rates for Certain Mailings of Educational and Nonprofit Organizations hearings before the United States House Committee on Post Office and Civil Service, Subcommittee Appointed To Consider H.R. 2587 and H.R. 4975, Eighty-Seventh Congress, first session, on July 28, 1961

"Reduced postal rates for certain mailings of educational and nonprofit organizations : hearing before the Committee on Post Office and Civil Service, House of Representatives, Eighty-seventh Congress, first session, on H.R. 2587 ... H.R. 4975 ... July 28, 1961"
"Reduced Postal Rates for Certain Mailings of Educational and Nonprofit Organizations hearings before the United States House Committee on Post Office and Civil Service, Subcommittee Appointed To Consider H.R. 2587 and H.R. 4975, Eighty-Seventh Congress, first session, on July 28, 1961"@en