'X-ray diffraction and its impact on physics', 'Crystallography at the Royal Institution', 'Reminiscences' and other contributions to Fifty years of X-ray diffraction edited by P.P. Ewald (1962) Background material and manuscript notes (1928; 1931; undated). Includes letter to Lonsdale from W.H. Bragg, 30 October 1928; typescript list of annual expenses by Lonsdale, 1931. 1928-1931