SPECIAL COLLECTIONS
Philadelphia. National Philatelic Museum. ESOG 56th Annual S.P.A. Convention, August 17, 18, «P9K9 19, and 20th 1950; 56 Annual Exhibition, National »P53M Philatelic Museum, August llth, to September 13th, Vine 1950. Philadelphia, National Philatelic Museun, no.6 1950.
627-770p. illus. 23cm. (Its Official bulle- tin, v.2,no.6)
1. Postage-stamps--Exhibitions. I. Society of Philatelic Americans.