National Philatelic Museum
The sixteenth American Philatelic Congress : National Philatelic Museum : exhibition, October 15th to November 15th, seminar, October 23, 24, 25, 26, convention October 27, 28, 29, 1950. - Philadelphia : The Museum, [1950] - National Philatelic Museum ; v. 2, no. 8 .
Stamp collecting--United States
Philatelic Congress
Stamp collectors--United States
The sixteenth American Philatelic Congress : National Philatelic Museum : exhibition, October 15th to November 15th, seminar, October 23, 24, 25, 26, convention October 27, 28, 29, 1950. - Philadelphia : The Museum, [1950] - National Philatelic Museum ; v. 2, no. 8 .
Stamp collecting--United States
Philatelic Congress
Stamp collectors--United States