Pelican, W. - the post in of the postal service (a study over the central courier service in the earlier German Demokratic Republik (East Germany)) 1994 and West Berlin (documents to the currency reform 1948 / 49) 3. issue as well Strobel / goat grass - Soviet regional mail censorship in Germany 1945 till 1950 (handbook and catalogue 1997), good till excellent condition