http://dewey.info/scheme/edition/e23/ en
943.108 1866-
943.1087 Period of East Germany, 1945-1990
943.10874 1945-1949 943.10875 Administration of Walter Ulbricht, 1949-1971 943.10877 Administration of Erich Honecker, 1971-1989 943.10879 1989-1990
http://dewey.info/scheme/edition/e22/ de
943.108 1866–
943.1087 Nordostdeutschland in den Jahren 1945–1990
943.10874 1945–1949 943.10875 Amtsperiode von Walter Ulbricht, 1949–1971 943.10877 Amtsperiode von Erich Honecker, 1971–1989 943.10879 1989–1990
Dewey Decimal Classification
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