- FondsJeffreys - Papers and correspondence of Sir Harold Jeffreys
- SeriesC1-C35 - Lectures
- SubseriesC1-C6 - Occasional lectures
- FileC1 - Commemoration Sermon
- FileC2 - Vetlesen Prize for Earth Science Achievement
- FileC3 - Probability Theory in Seismology
- FileC4 - Cambridge Mathematics since 1910
- FileC5 - Discussion on Planetary Atmospheres. Introduction
- FileC6 - On the Psychological Significance of Death Duties