http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
a guide to primary sources and research institutions of the Soviet zone of occupation and the German Democratic Republic; 1945 - 1990
Bernd Schäfer; Henning Hoff; Ulrich Mählert
Reference guide / German Historical Institute, Washington, DC 14
Deutsches Historisches Institut Washington DC