- FondsLarmor - Papers of Sir Joseph Larmor
- SeriesLetters - Letters to and from Larmor
- SubseriesTo Larmor - Letters to Larmor
- FileOrr (Misc) - Letters from William McFadden Orr
- ItemOR1/1 - Autograph letter, signed, from Rathgar
- ItemOR1/2 - Autograph letter, signed, from Dublin
- ItemOR1/3 - Autograph letter, signed, from Dublin
- ItemOR1/4 - Autograph letter, signed, from JL to WMO, from St John's College, and autograph letter, signed, from WMO
- ItemOR1/5 - Autograph letter, signed, from Dublin
- ItemOR1/6 - Autograph letter, signed, from Dublin
- ItemOR1/7 - Autograph letter, signed, from Comber
- ItemOR1/8 - Autograph letter, signed, from Dublin
- 21 more...