- FondsJeffreysB - Papers of Bertha Jeffreys
- SeriesC - Research
- SubseriesC5-C60 - Research folders
- FileC15-C18 - '1931-3 Stellar opacity'
- ItemC15 - Explanatory note by Jeffreys, 1978; correspondence with E.A. Milne, May 1931
- ItemC16 - Offprint of 'The co-efficients of absorption and opacity of a partially degenerate gas' by Jeffreys (see D12) with later corrections intercalated; manuscript calculation of 'Absorption per unit intensity...'
- ItemC17 - Manuscript notes on 'Stellar interiors' dated February 1935 (Students' Colloquium); manuscript calculations 1939, 1942
- ItemC18 - Manuscript calculations