manipulation]. Edition Interfrom AG: Zürich, 1977. Hellmann, Manfred W. (ed.) [On public usage in the Federal Republic of Germany and in the GDR]. Düsseldorf: Pädagogischer Verlag Schwann, 1973. Reich, Hans H. [Language and politics: studies on vocabulary and terminology of the official use of language in the GDR]. Munich: Max Hueber Verlag, 1968. Schlosser, Horst Dieter (ed). [Communications requirements and everyday language in the former GDR]. Hamburg: Helmut Buske Verlag, 1991. Siegl, Elke Annalene. [Duden East, Duden West: On language in Germany since 1945: a comparison of Leipzig and Mannheim editions of Duden since 1947]. Düsseldorf: Schwann, 1989. External links 1880 non-fiction books German dictionaries German language Spelling dictionaries