Catalogue of the postage stamps and stamped envelopes of the United States and possessions, issued prior to January l, 1919 - Leavy, Joseph Britton, 1872-1921.; Smithsonian Institution (Washington : Govt. Print. Off., 1919)
At head of title: Smithsonian Institution. United States National Museum.
Mode of access: Internet.
Keywords: Postage stamps -- United States