. "WL3000/9/1/1003" . . . "Correspondence with Müller, Ernst K."@en . "Working on a study on the persecution of Jews in the German state of Hesse, the letters concern an enquiry by Müller for source material on this topic."@en . "Ernst K. Müller conducted research at the university in Frankfurt am Main in the early 1960s."@en . . "This material has been digitised. Readers should book a reading room terminal to access it."@en . . . . . . "4 letters"@en .