National Philatelic Museum
Austria centenary stamp exhibition : March 18 to April 13, 1950 / held under the auspices of the Austria Philatelic Society ; sponsored by His Excellency, Ludwig Kleinwaechter ... [et al.]. - Phila., Pa. : National Philatelic Museum, [1950] - Official bulletin / National Philatelic Museum ; v. 2, no. 3 .
Cover title: Austria.
Postage stamps--Austria
Austria centenary stamp exhibition : March 18 to April 13, 1950 / held under the auspices of the Austria Philatelic Society ; sponsored by His Excellency, Ludwig Kleinwaechter ... [et al.]. - Phila., Pa. : National Philatelic Museum, [1950] - Official bulletin / National Philatelic Museum ; v. 2, no. 3 .
Cover title: Austria.
Postage stamps--Austria