The Smithsonian press contribution to history and technology # 56 The Winton M. Blount Postal History Symposia, select papers, 2010-2011. 130 plus pages of postasl history historical papers. here are just a couple of the papers to interst you Hermes , Message and Messenger p.11 Debating Identity and origins with early 20th century American Commeratives p. 27 Stalin on Stamps: design, propaganda and Politics. My favorites: The Transmississippi Exposition commerative stamp issue and National Identity..... Live Chicks ~ require First Class Treatment: The U.S. Special Handling Service United States Parcel Post system: postage due stamps and proofs. The publication is available free for download as a 14Megabyte .pdf file http://www.sil.si.edu/smithsoniancontributions/HistoryTechnology/sc_RecordSingle.cfm?filename=SCHT56 There are many more similar publications available on the site as you explore. Jim