. "WL3000/9/1/355" . . "4 letters"@en . "Correspondence with Drubba, Helmut"@en . . . . "Correspondence regarding an enquiry on the date of death of German chemist Willy Marckwald. Contained is a letter by Alfred Hirschberg."@en . . . . . "Helmut Drubba was a physicist from West Germany."@en . "This material has been digitised. Readers should book a reading room terminal to access it."@en .