- FondsJeffreysB - Papers of Bertha Jeffreys
- SeriesJ - Correspondence
- SubseriesJ1-J42 - Family
- 3 more...
- FileJ5-J10 - Bundle of correspondence, principally between Jeffreys and her aunt Bertha Blaxby
- FileJ11-J15 - 'Letters from Michael Stewart & Bertha Swirles (1920s & 1930s)'
- FileJ16-J17 - 'Letters to Lady J from her aunt Bertha'
- FileJ18 - Postcard from Jeffreys to her mother from Italy, September
- FileJ19 - 'Letters to BB 1950s'
- FileJ20-J27 - Correspondence from Jeffreys to Bertha Blaxby
- FileJ37 - 'Letters from BJ 1958 IAU Moscow & Leningrad Stockholm, Copenhagen'
- 3 more...