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This file has been used in: Deutscher Botschafter in London hat in Clausthal studiert (in de). tu-clausthal.de / Technische Universität Clausthal (2015-06-25). Retrieved on 2015-07-08. web.archives.org

This file has been used in: An interdisciplinary soundboard for British-German relations. (in de). europeancollections.wordpress.com (2016-03-23). Retrieved on 2016-05-02. web.archives.org