By Ernst M. Cohn. Copyright 1988. Softcover, A4 format, 110 pages spiralbound.

Ernst Max Cohn (March 31, 1920 December 30, 2004), was a multi-lingual philatelic researcher and expert who advocated re-researching original philatelic sources rather than relying on subsequent published philatelic literature.

Cohn was a member of the most important philatelic societies in the United States, France, Belgium and the United Kingdom. At the American Philatelic Society, he served a number of posts, including representative to the FIP Postal History Commission and on the Postal History Committee. At the Postal History Society he held a number of posts including president and associate editor.

He authored a number of books during his philatelic career, including: Die Papillons von Metz (1976), The Flight of the Ville dOrleans (1978), Ordinary Mail by Diplomatic Means (1995), Unusual Mail in Occupied France 18701871 (2000), and A Book of Postal History (1988) which contained many of his articles he had previously written for The American Philatelist.