- FondsJeffreysB - Papers of Bertha Jeffreys
- SeriesJ - Correspondence
- SubseriesJ1-J42 - Family
- FileJ33-J36 - 'Letters from BJ in U.S.A. to Northampton 1950-51'
- ItemJ33 - Calendar 1950-1951 covering the visit to the USA
- ItemJ34-J35 - Letters home, kept in the form of a journal
- ItemJ36 - Postcard memorabilia sent home by Jeffreys; two letters received