. "4 letters"@en . "WL3000/9/1/1478" . "This material has been digitised. Readers should book a reading room terminal to access it."@en . . "Correspondence with Wachtel, Helene"@en . . . . . "Correspondence regarding an enquiry by The Wiener Library for the translation of a Danish language source on Fritz Clausen."@en . . . . "Dr Helene Wachtel was a Copenhagen based Jewish refugee and sister of a Wiener Library staff member."@en . .