- FondsJeffreysB - Papers of Bertha Jeffreys
- SeriesE - Lectures
- SubseriesE54-E91 - Public and invitation lectures
- ItemE54 - Jeffreys's manuscript note found with lecture notes
- ItemE55 - Untitled lecture on developments in quantum theory, Adams Society (St Johns College Cambridge mathematics society), 1927
- ItemE56 - 'Quantum mechanics applied to everyday problems'
- ItemE57 - 'Elementary applications of vectors & tensors', ?Mathematical Association, Bristol, 1931 or 1932
- ItemE58 - Untitled lecture on mathematics for physicists, Cambridge Physical Society, 2 March 1944
- ItemE59 - 'Atomic wave functions', Trinity Mathematical Society, Cambridge, 16 November 1944
- ItemE60 - 'Stability', The New Pythagoreans, Cambridge, 1952
- ItemE61 - 'The conflict of studies', Mathematical Association Sydney branch, Australia, 31 July 1959
- ItemE62 - 'Top People take the Times', Oxford, ?1960
- 16 more...