SPECIAL COLLECTIONS Philadelphia. National Philatelic Museum. *scG International Topical Stamp Exhibition, Jan- .P9L9 uary 21-February 13, 1950. Philadelphia, Nation- ~P53M al Philatelic Museum, 1950. Wine 122p. illus. 23cm. (Its Official bulletin, no.1 v.2,no.1)
1. Postage-stamps--Topics--Exhibitions. Bis iii: 3 Collectors & collecting.
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