| RefNo | Title | Date |
| IM/Maull/003440 | Parsons, William, 3rd Earl of Rosse | nd |
| NLB/2/680 | Copy letter from Herbert Rix, to Joseph Norman Lockyer, Fellow of the Royal Society | 11 October 1888 |
| NLB/3/397 | Copy letter from Herbert Rix, to [Laurence Parsons] the Earl of Rosse, Fellow of the Royal Society | 31 May 1889 |
| NLB/3/391 | Copy letter from an unknown correspondent, to Harrison & Sons | 30 May 1889 |
| NLB/12/314 | Copy letter from Herbert Rix, to the Earl of Rosse [Laurence Parsons], Fellow of the Royal Society | 28 January 1896 |
| NLB/19/12 | Copy letter from Robert William Frederick Harrison, to Sir Clements Robert Markham, President, Royal Geographical Society | 2 June 1899 |
| NLB/19/13 | Copy letter from Robert William Frederick Harrison, to the Earl of Rosse, Laurence Parsons, Fellow of the Royal Society | 2 June 1899 |
| NLB/18/324 | Copy letter from Robert William Frederick Harrison, to the Earl of Rosse, Fellow of the Royal Society | 22 February 1899 |
| NLB/19/37 | Copy letter from Robert William Frederick Harrison, to Sir Clements Robert Markham, Fellow of the Royal Society, President of the Royal Geographical Society | 6 June 1899 |
| NLB/22/226 | Copy letter from Robert William Frederick Harrison, to the Earl of Rosse [Laurence Parsons], Fellow of the Royal Society, Birr Castle, Parsonstown, Ireland | 27 March 1901 |
| NLB/23/2/68 | Copy letter from Sir Michael Foster, to The Earl of Rosse [Laurence Parsons], Fellow of the Royal Society and John Young Buchanan, Fellow of the Royal Society | 14 May 1901 |
| NLB/31/913 | Copy letter from the Earl of Rosse [Laurance Parsons] and Herbert Hall Turner, to Dr James Whitbread Lee Glaisher, Fellow of the Royal Society | 6 December 1905 |
| NLB/31/324 | Copy letter from Theodore E James, to Lord Rosse [Laurence Parsons], Fellow of the Royal Society | 3 August 1905 |
| NLB/31/708 | Copy letter from Robert William Frederick Harrison, to the Earl of Rosse [Laurence Parsons], Fellow of the Royal Society | 3 November 1905 |
| RR/7/263 | Referee's report by George Biddell Airy, on a paper 'On the radiation of heat from the moon, the law of its absorption by our atmosphere, and of its variation in amount with her phases' by Laurence Parsons, Earl of Rosse | 29 May 1873 |
| NLB/3/403 | Copy letter from Herbert Rix, to the [Laurence Parsons] Earl of Rosse, [Fellow of the Royal Society] | 1 June 1889 |
| NLB/3/721 | Copy letter from Herbert Rix, to the Secretary of The Pasteur Fund, Mansion House | 24 September 1889 |
| NLB/31/497 | Copy letter from Robert William Frederick Harrison, the Right Honourable, the Earl of Rosse [Laurence Parsons], Fellow of the Royal Society | 29 September 1905 |
| RR/7/384 | Referee's report by Laurence Parsons, Earl of Rosse on a paper 'On polishing the specula of reflecting telescopes' by William Lassell | 5 February 1875 |
| RR/8/181 | Referee's report by George Biddell Airy, on a paper 'On some recent improvements made the mountings of the telescopes at Birr Castle' by Lawrence Parsons, 4th Earl of Rosse | 27 November 1879 |
| MC/9/402 | Letter from [Laurence Parsons], Lord Rosse, Castle, Parsonstown, to [Walter] White, [Assistant Secretary of the Royal Society] | 30 July 1872 |
| MC/9/581 | Letter from Robert H [Henry] Scott, Director of the Meteorological Office, 116 Victoria Street, London, to the Secretary of the Royal Society | 16 June 1873 |
| MC/9 | Volume 9 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1870-June 1873 |
| MC/11/40 | Letter from Robert H [Henry] Scott, Meteorological Office, 116 Victoria Street, London, to [Walter] White, [Assistant Secretary of the Royal Society] | 31 March 1877 |
| MC/11/42 | Letter from the Earl of Rosse, Meteorological Office, 116 Victoria Street, London, to [Joseph Dalton Hooker], President of the Royal Society and to the Council | 31 March 1877 |
| MC/11 | Volume 11 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1877-1879 |
| RR/7/264 | Referee's report by James Prescott Joule, on a paper 'On the radiation of heat from the moon, the law of its absorption by our atmosphere, and of its variation in amount with her phases' by Laurence Parsons, Earl of Rosse | 4 June 1873 |
| RR/7/383 | Letter from the Laurence Parsons, Earl of Rosse on a paper 'On polishing the specula of reflecting telescopes' by William Lassell | 15 February 1875 |