. . . . . . . "Correspondence with Seyffert, Hans"@en . "This material has been digitised. Readers should book a reading room terminal to access it."@en . . "18 letters"@en . "Hans Seyffert was the son of reverend Erich Seyffert, a friend of Alfred Wiener."@en . . "WL3000/9/1/1264" . "Correspondence on various subjects including the literature of Franz Viktor Werfel."@en .