- FondsJeffreysB - Papers of Bertha Jeffreys
- SeriesJ - Correspondence
- SubseriesJ1-J42 - Family
- FileJ28-J32 - 'HJ to BS 1939-40 and 1967'
- ItemJ28 - Correspondence, chiefly on scientific problems
- ItemJ29 - Correspondence, chiefly on scientific problems
- ItemJ30 - 'Possible approach to Q.M.'
- ItemJ31 - Marriage of Harold Jeffreys and Bertha Swirles, Northampton, 6 September 1940
- ItemJ32 - Correspondence from Sir Harold at Southern Methodist University, Texas, USA