- FondsJeffreysB - Papers of Bertha Jeffreys
- SeriesC - Research
- SubseriesC5-C60 - Research folders
- FileC28-C34 - 'Helium triplets 1936'
- ItemC28 - Explanatory note by Jeffreys beginning, 'This was a laborious piece of work and the comparison with [I.P.] Grant's work was never fully worked out...I tried about 1950 to do this but without success', 1977 with 1992 addition
- ItemC29 - Correspondence to Jeffreys
- ItemC30 - Manuscript draft beginning, 'The method of the s.c.f. has proved extremely fruitful in giving accurately the position of spectral terms [...]'
- ItemC31 - Sets of manuscript calculations numbered I-VI
- ItemC32-C33 - Manuscript calculations
- 1 more...