1. Medical Research Council. ‘Proposed central committee for studies in radiology’. 1921. FD 1/737. The National Archives.
2. Medical Research Council, W. Fletcher, ‘Letter to G. Newman’, 15th December 1923. FD 1/2037. The National Archives.
3. Medical Research Council. G. Newman, ‘Letter to W. Fletcher’ 2nd April 1925. FD1/697. The National Archives.
4. Medical Research Council. W. Fletcher, ‘Letter to G. Newman’, 3rd April 1925. FD1/697. The National Archives.
5. Medical Research Council. W. Fletcher, ‘Letter to BECC secretary’, 4th August 1925. FD1/697. The National Archives.