- FondsJeffreys - Papers and correspondence of Sir Harold Jeffreys
- SeriesC1-C35 - Lectures
- SubseriesC7-C29 - Various addresses
- 12 more...
- FileC18 - Saturn
- FileC19 - Scientific Method and Philosophy
- FileC20 - The simple pendulum [?in] the resonance case
- FileC21 - The strength of the Earth
- FileC22 - The structure of the Earth
- FileC23 - Thermal instability and its geophysical applications
- FileC24 - Unsolved problems in Seismology
- FileC25 - Reminiscences ? for St John's College occasion and Lambton Worm
- FileC26 - aspects of probability theory
- 2 more...