- 1Correspondence with Geoffrey Parr (BURD/A/01)
1941-1947, sub-series - 2Letter from Geoffrey Parr to William Grey Walter, August 1941 (BURD/A/01/GP3)
27 August 1942, item - 3Letter from William Grey Walter to Geoffrey Parr (BURD/A/01/GP5)
27 November 1942, item - 4Letter from William Grey Walter to Geoffrey Parr, 18 October 1945 (BURD/A/01/GP7)
18 October 1945, item - 5Letter from William Grey Walter to Electronic Engineering (BURD/A/01/GP9)
31 December 1947, item - 6Correspondence with the Edison Swan Electric Company (BURD/A/02)
1939-1948, sub-series - 7Letter from William Grey Walter to Geoffrey Parr, 25 July 1939 (BURD/A/02/01)
25 July 1939, item - 8Letter from William Grey Walter to Geoffrey Parr, 27 July 1939 (BURD/A/02/03)
27 July 1939, item - 9Letter from William Grey Walter to S.R. Snodgrass, 31 July 1939 (BURD/A/02/05)
31 July 1939, item - 10Letter from William Grey Walter to Geoffrey Parr, 31 July 1939 (BURD/A/02/06)
31 July 1939, item - 11Letter from William Grey Walter to Geoffrey Parr, 9 August 1939 (BURD/A/02/08)
9 August 1939, item - 12Letter from William Grey Walter to Geoffrey Parr, 10 August 1939 (BURD/A/02/09)
10 August 1939, item - 13Letter from William Grey Walter to Harvey Flack, 21 August 1939 (BURD/A/02/10)
21 August 1939, item - 14Letter from William Grey Walter to Geoffrey Parr, 22 September 1939 (BURD/A/02/11)
22 September 1939, item - 15Letter from William Grey Walter to Geoffrey Parr, 18 October 1939 (BURD/A/02/12)
18 October 1939, item
