Excerpt from Smithsonian Institution, United States National Museum, Bulletin 105: Catalogue of the Postage Stamps and Stamped Envelopes of the United States and Possessions, Issued Prior to January 1, 1919
This catalogue of United States postage Это и многое другое вы найдете в книге Smithsonian Institution, United States National Museum, Bulletin 105 (Joseph B. Leavy)