Photograph of the panel sent to Betty by J.F. Richardson (1980), Optical Munitions Panel correspondence (1939-1945).

Laby, Thomas H., Photograph of the panel sent to Betty by J.F. Richardson (1980), Optical Munitions Panel correspondence (1939-1945). (1939-1980), [UMA-IT-000047194]. University of Melbourne Archives, accessed 30/04/2026, https://archives.library.unimelb.edu.au/nodes/view/511821