- FondsJeffreysB - Papers of Bertha Jeffreys
- SeriesJ - Correspondence
- SubseriesJ1-J42 - Family
- FileJ1-J2 - 'Letters. Mother; BB b 1902-19'
- FileJ3 - 'August 1914 postcard and letter from Mother in Whitby to BJ'
- ItemJ4 - Postcard to Jeffreys from 'Jack', December
- 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
- 6 more...