Books Containing references to the E-Series Postmarks WWII Postmarks of the Australian Forces from all Fronts 1939 to 1953 by Stephenson Stobbs. pub. 2nd ed. 1976, Harry Hayes. Consists mainly of lists of the postmarks and their locations. All postmarks illustrated. One of the Ted Proud military history books Pub 1982. British Military Postmarks in Egypt 1932-1956 by John Davis Pub 2014 Only considers the E-Series as used in Egypt