- FondsLarmor - Papers of Sir Joseph Larmor
- SeriesLetters - Letters to and from Larmor
- SubseriesTo Larmor - Letters to Larmor
- FileCaldecott (Misc) - Letters from Alfred Caldecott
- ItemCA1/1 - Autograph letter, signed, from St John's
- ItemCA1/2 - Autograph letter, signed, from St John's
- ItemCA1/3 - Autograph letter, signed, from St John's
- ItemCA1/4 - Autograph letter, signed, from Lopham, Thetford
- ItemCA1/5 - Autograph letter, signed, from Lopham, Thetford
- ItemCA1/6 - Autograph letter, signed, from University of London