- FondsLarmor - Papers of Sir Joseph Larmor
- SeriesLetters - Letters to and from Larmor
- SubseriesTo Larmor - Letters to Larmor
- FileHorton-Smith (Misc) - Letters from Lionel Graham Horton Horton-Smith
- ItemHO5/1 - Autograph letter, signed, from London
- ItemHO5/2 - Autograph letter, signed, from London
- ItemHO5/3 - Autograph letter, signed, from London