| Description | 178 letters: 4 letters, Zoology Department, University College London, United Kingdom, 26 Nov 1935-27 [Jun] 1935; 37 letters Sedgwick Museum, Cambridge, United Kingdom, 28 Jan 1936 - 23 Jul 1939; 127 letters, Department of Geology, University of Leeds, United Kingdom, 18 Nov 1939 - 1 Jul 1970 |