SPECIAL
COLLECTIONS
*scG .P9K9 .P53M Ves
no. 3
Philadelphia. National Philatelic Museum. Centennial Exposition, the First U.S. le, 3c and 12c Postage Stamps, 1851-1857; the '51 Cenex,
July 1-July 31, 1951. Philadelphia, National Philatelic Museum, 1951.
315-490p. illus. 23cm. (Its Official bulle- fin, 0. 3,763)
1. Postage-stamps--U.S.--Anniversaries. 2. Postage-stamps--U.S.--Exhibitions.
@ 10