Luftwaffe Rudder Markings, 1936-1945 Schiffer Military History: Karl Ries, Ernst Obermaier: 9780887403378: Amazon.com: Books Posted on April 4, 2014 by bbri420 Luftwaffe Rudder Markings, 1936-1945 Schiffer Military History: Karl Ries, Ernst Obermaier: 9780887403378: Amazon.com: Books.