I visited or sent requests to the following German archives:
- Town archives in Altena, Babenhausen, Bingen, Bonn, Bornheim, Dortmund, Essen, Frankfurt am Main, Gelsenkirchen, Gladbeck, Hattingen, Koblenz, Mülheim, Neuwied, Ruppichteroth, Recklinghausen, Remscheid, Selm, Solingen, Velbert, Wuppertal and others (Civil records and registration cards)
- Landesarchiv Duisburg, Abteilung Rheinland (state archive of North-Rhine-Westphalia: de-nazification files, Gestapo files and court files)
- Compensation file archives of Bezirksregierung Düsseldorf (moves to state archive NRW), Saarburg (Rhineland-Palatinate) and Landesarchiv Wiesbaden (Hessen)
- Bundesarchiv Koblenz (court files of the British occupation zone)
- ITS Bad Arolsen (International tracing service)
- Landesarchiv Hessen (state archive of Hesse: online civil records under Staatsarchive/Marburg/Personenstandsarchiv)
- Landesarchiv Baden-Württemberg (online Jewish civil registers)
- Archive Bas-Rhin (online civil registers Alsace)
- Historisches Archiv Köln (online death registers)