| RefNo | Title | Date |
| EC/1895/13 | McClean, Frank: certificate of election to the Royal Society | |
| NLB/22/530 | Copy letter from Robert William Frederick Harrison, to Frank McClean, Fellow of the Royal Society | 30 May 1901 |
| NLB/16/178 | Copy letter from Robert William Frederick Harrison, to Direct Photo-Engraving Company Limited | 15 February 1898 |
| NLB/12/805 | Copy letter from an unknown correspondent, to Messrs Harrison & Sons | 7 May 1896 |
| NLB/11/683 | Copy letter from Herbert Rix, to Frank McClean, Fellow of the Royal Society | 16 September 1895 |
| NLB/13/752 | Copy letter from Robert William Frederick Harrison, to Frank McClean, Fellow of the Royal Society | 17 November 1896 |
| NLB/15/522 | Copy letter from Robert William Frederick Harrison, to Frank McClean, Fellow of the Royal Society, Rusthall House, Tunbridge Wells | 21 October 1897 |
| NLB/14/488 | Copy letter from Arthur William Rucker, to Mr Frank McClean, [Fellow of the Royal Society] | 18 March 1897 |
| NLB/14/544 | Copy letter from Arthur William Rucker, to Mr Frank McClean, [Fellow of the Royal Society] | 26 March 1897 |
| MC/19/587 | Letter from William N McClean, 1 Onslow Gardens, to the Secretary of the Royal Society | 9 November 1904 |
| NLB/16/469 | Copy letter from Robert William Frederick Harrison, to F McClean, Fellow of the Royal Society | 19 April 1898 |
| NLB/16/56 | Copy letter from Robert William Frederick Harrison, to Dr F McClean, Fellow of the Royal Society | 21 January 1898 |
| NLB/16/779 | Copy letter from Robert William Frederick Harrison, to the Direct Photo Engraving Company Limited | 4 June 1898 |
| NLB/17/513 | Copy letter from Robert William Frederick Harrison, to Dr Frank McClean, Fellow of the Royal Society | 10 November 1898 |
| NLB/16/66 | Copy letter from A H White, to F Perry, Direct photo-engraving Company | 26 January 1898 |
| NLB/16/538 | Copy letter from Robert William Frederick Harrison, to F McClean, Fellow of the Royal Society | 26 April 1898 |
| NLB/16/119 | Copy letter from Robert William Frederick Harrison, to Direct Photo Engraving Company Limited | 5 February 1898 |
| NLB/16/59 | Copy letter from Robert William Frederick Harrison, to R T Glazebrook, Fellow of the Royal Society | 21 January 1898 |
| NLB/15/518 | Copy letter from Robert William Frederick Harrison, to Sir Joseph Norman Lockyer, Fellow of the Royal Society | 21 October 1897 |
| NLB/16/376 | Copy letter from Robert William Frederick Harrison, to the Manager, Direct Photo-Engraving Company | 23 March 1898 |
| NLB/16/489 | Copy letter from Robert William Frederick Harrison, to F McClean, Fellow of the Royal Society | 21 April 1898 |
| NLB/17/98 | Copy letter from Robert William Frederick Harrison, to Frank McClean, Fellow of the Royal Society | 14 July 1898 |
| NLB/15/431 | Copy letter from Robert William Frederick Harrison, to Messrs Robarts Lubbock & Company, 15 Lombard Street, E.C. | [2 October 1897] |
| NLB/17/3 | Copy letter from Robert William Frederick Harrison, to Frank McClean, Fellow of the Royal Society | 29 June 1898 |
| NLB/17/75 | Copy letter from Robert William Frederick Harrison, to Messrs Dulau & Company, 37 Soho Square, W. | 11 July 1898 |
| NLB/17/129 | Copy letter from Robert William Frederick Harrison, to Messrs Robarts, Lubbock & Company | 22 July 1898 |
| NLB/15/868 | Copy letter from Robert William Frederick Harrison, to Frank McClean, Fellow of the Royal Society | 5 January 1898 |
| NLB/17/113 | Copy letter from Robert William Frederick Harrison, to Messrs Robarts, Lubbock & Company | 20 July 1898 |
| NLB/17/150 | Copy letter from Robert William Frederick Harrison, to Frank McClean, Fellow of the Royal Society | 27 July 1898 |
| NLB/17/417 | Copy letter from Robert William Frederick Harrison, to H Gouldie Wilson, Dunedin House, 2 Basinghall Avenue, E.C. | 25 October 1898 |
| NLB/17/435 | Copy letter from Robert William Frederick Harrison, to Messrs Cocks Biddulph & Company | 31 October 1898 |
| NLB/17/468 | Copy letter from Robert William Frederick Harrison, to Messrs Robarts, Lubbock & Company | 4 November 1898 |
| NLB/19/167 | Copy letter from Robert William Frederick Harrison, to Frank McClean, Fellow of the Royal Society | 5 July 1899 |
| NLB/18/653 | Copy letter from Robert William Frederick Harrison, to Frank McClean, Fellow of the Royal Society | 15 April 1899 |
| NLB/21/651 | Copy letter from Robert William Frederick Harrison, to Frank McClean, Fellow of the Royal Society | 2 January 1901 |
| NLB/28/273 | Copy letter from Robert William Frederick Harrison, to Frank McClean, Fellow of the Royal Society | 10 February 1904 |
| RR/13/222 | Referee's report by William Huggins, on a paper 'Comparative photographic spectra of stars to the 3½ magnitude' by Frank McClean | 21 April 1897 |
| NLB/14/430 | Copy letter from Arthur William Rucker, to Professor [James] Dewar, [Fellow of the Royal Society] | 10 March 1897 |
| NLB/16/58 | Copy letter from Robert William Frederick Harrison, to Sir William Huggins, Fellow of the Royal Society | 21 January 1898 |
| NLB/15/340 | Copy letter from Robert William Frederick Harrison, to Frank McClean, Fellow of the Royal Society | 13 August 1897 |
| RR/13/223 | Referee's report by William Henry Mahoney Christie, on a paper 'Comparative photographic spectra of stars to the 3½ magnitude' by Frank McClean | 12 May 1897 |
| MC/19/585 | Letter from Ellen McClean, 1 Onslow Gardens, to Dr [Joseph] Larmor | 16 December 1904 |
| MC/19/586 | Letter from John R McClean, William N McClean and [?] McClean, 1 Onslow Gardens, to Sir William Huggins, President of the Royal Society | 13 November 1904 |
| MC/19/649 | Letter from [Hugh Frank] Newall, Madingley Rise, Cambridge, to [Robert William Frederick] Harrison | 3 December 1904 |
| MC/19 | Volume 19 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1904 |