Correspondence with colleagues and friends

Description: Birch, J. F. N. Fleming, J. Re visit to Royal Engineer Board's experimental ground, Hythe Hankey, M. P. A. Re co-ordination of research Hoare, S. Trenchard, H. M. Re bomb-sights

Date: 01/01/1927 - 31/12/1927

Last import: September 11, 2017