| RefNo | Title | Date |
| NLB/14/232 | Copy letter from an unknown correspondent, to Dr Henry Woodward, Fellow of the Royal Society | 27 January 1897 |
| NLB/18/138 | Copy letter from Theodore E James, to Messrs Harrison & Sons | 23 January 1899 |
| RR/7/257 | Referee's report by Robert Etheridge, on a paper 'Contributions to the study of the errant annelides of the older palaeozoic rocks' by Henry Alleyne Nicholson | 5 November 1873 |
| AP/55/12/2 | Unpublished figure, 'Burrows of Arenicolites sparsus and Arenicolites robustus (after Salter)' by Henry Alleyne Nicholson | 1872 |
| AP/55/12/4 | Unpublished figure, 'Cruziana (Rusophycus)' by Henry Alleyne Nicholson | 1872 |
| AP/55/12/5 | Unpublished figure, 'Annelide-burrows' by Henry Alleyne Nicholson | 1872 |
| AP/55/12/3 | Unpublished figure, 'Histioderma Hibernicum' by Henry Alleyne Nicholson | 1872 |
| EC/1897/22 | Nicholson, Henry Alleyne: certificate of election to the Royal Society | |
| RR/7/258 | Referee's report by Peter Martin Duncan, on a paper 'Contributions to the study of the errant annelides of the older palaeozoic rocks' by Henry Alleyne Nicholson | 2 December 1873 |
| MC/9/535 | Letter from H [Henry] Alleyne Nicholson, University College, Toronto, Canada, to Walter White, Assistant Secretary of the Royal Society, London | 17 April 1873 |
| MC/9 | Volume 9 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1870-June 1873 |
| AP/55/12/8 | Unpublished figure, 'Small specimen of Myrianites tenuis (McCoy)' by Henry Alleyne Nicholson | 1872 |
| AP/55/12/9 | Unpublished figures, Palaeozoic rocks by Henry Alleyne Nicholson | 1872 |
| AP/55/12/6 | Unpublished figure, 'Diagram to represent the formation of Crossopodia' by Henry Alleyne Nicholson | 1872 |
| AP/55/12/7 | Unpublished figure, 'Diagram of the trail of Nemertites' by Henry Alleyne Nicholson | 1872 |
| AP/55/12/1 | Unpublished manuscript, 'Contributions to the study of the errant annelides [annelids] of the older Palaeozoic rocks' by H [Henry] Alleyne Nicholson | 1872 |
| AP/55/12 | Unpublished paper, 'Contributions to the study of the errant annelides [annelids] of the older Palaeozoic rocks' by H [Henry] Alleyne Nicholson | 1872 |