"21 letters"@en . . "Correspondence regarding an enquiry by Jaennicke for source material required for a biography of Fritz Haber. Contained are related letters with third persons on this issue as well as a printed call for material about Haber."@en . "WL3000/9/1/670" . "Correspondence with Jaenicke, Johannes"@en . . . . "Johannes Jaennicke (1888-1984) was a German chemist. He had been a co-worker and friend of Nobel Prize Laureate Fritz Haber."@en . . . . . "This material has been digitised. Readers should book a reading room terminal to access it."@en . .