| RefNo | Title | Date |
| EC/1899/21 | Neumayer, Georg Balthasar von: certificate of election to the Royal Society | |
| MM/14/130 | A list of 15 volumes of observations made at Melbourne presented by GB Neumayer to the Royal Society | 1869 |
| NLB/16/486 | Copy letter from Robert William Frederick Harrison, to Messrs Harrison & Sons | 21 April 1898 |
| NLB/16/420 | Copy letter from Robert William Frederick Harrison, to Professor Dr G Neumayer, Hamburg, Germany | 1 April 1898 |
| NLB/16/84 | Copy letter from Arthur William Rucker, to Professor Dr G Neumayer, Deutsche Seewarte, Hamburg, Germany | 27 January 1898 |
| NLB/16/161 | Copy letter from Arthur William Rucker, to Sir George Baden Powell | 14 February 1898 |
| NLB/16/497 | Copy letter from Robert William Frederick Harrison, to Professor Dr G Neumayer, Deutsche Seewart, Hamburg, Germany | 22 April 1898 |
| NLB/16/630 | Copy letter from Robert William Frederick Harrison, to Professor Neumayer, Hamburg | 9 May 1898 |
| NLB/19/260 | Copy letter from Theodore E James, to Messrrs Harrison & Sons | 20 July 1899 |
| NLB/29/899 | Copy letter from Robert William Frederick Harrison, to Professor Dr Georg Balthasar von Neumayer, Foreign Member of the Royal Society | 9 January 1905 |
| MS/257/3/185 | Letter from Georg Balthasar Neumayer, 11 Gower Street to Edward Sabine | 20 April [1826-1909] |
| NLB/16/120 | Copy letter from Robert William Frederick Harrison, to Professor Arthur William Rucker | 5 February 1898 |
| NLB/29/504 | Copy letter from Robert William Frederick Harrison, to Dr Charles Chree, Fellow of the Royal Society, Old Deer Park, Richmond, Surrey | 27 October 1904 |
| NLB/32/267 | Copy letter from Robert William Frederick Harrison, to Herr Professor Dr Georg von Neumayer, Hohenzoller Strasses, 9, Neustadt an der Haardt | 10 February 1906 |
| MS/257/3/180 | Letter from Georg Balthasar Neumayer, Frankenthal to Edward Sabine | 9 March 1867 |
| MC/8/76 | Letter from G [Georg Balthasar] Neumayer, Frankenthal, to H B Wheatley | 27 August 1867 |
| MC/8/78 | Letter from G [Georg Balthasar] Neumayer, Frankenthal, to W [Walter] White, Assistant Secretary of the Royal Society | 7 September 1867 |
| MC/8/37 | Letter from G [Georg Balthasar] Neumayer, Frankenthal, to Lieutenant-General E [Edward] Sabine, President of the Royal Society | 8 April 1867 |
| MC/8/217 | Letter from [Georg Balthasar] Neumayer, 11 Gower Street, to Walter White, [Assistant Secretary of the Royal Society] | 11 June 1868 |
| MC/8/470 | Letter from G [Georg Balthasar] Neumayer, Frankenthal, Palatinate, to the Secretary of the Royal Society, London | 25 November 1869 |
| MC/8/180 | Letter from [Georg Balthasar] Neumayer, 11 Gower Street, to the Secretary of the Royal Society | 30 April 1868 |
| MS/257/3/178 | Letter from Georg Balthasar Neumayer, Frankenthal to Edward Sabine | 23 November 1865 |
| MS/257/3/186 | Letter from Georg Balthasar Neumayer, Sydenham to Edward Sabine | 16 June [1826-1909] |
| MS/257/3/189 | Letter from Georg Balthasar Neumayer, Frankenthal to Edward Sabine | 23 June 1870 |
| MS/257/3/172 | Letter from Georg Balthasar Neumayer, Flagstaff [Observatory], Melbourne to Edward Sabine | 18 August 1858 |
| MS/257/3/183 | Letter from Georg Balthasar Neumayer, Frankenthal to Edward Sabine | 29 October 1867 |
| MS/257/3/175 | Letter from Georg Balthasar Neumayer, Hamburg to Edward Sabine | 20 August 1865 |
| MS/257/3/187 | Letter from Georg Balthasar Neumayer, Sydenham to Edward Sabine | 6 May 1870 |
| MS/257/3/179 | Letter from Georg Balthasar Neumayer, Frankenthal to Edward Sabine | 21 August 1866 |
| MS/257/3/182 | Letter from Georg Balthasar Neumayer, Frankenthal to Edward Sabine | 17 December 1867 |
| MS/257/3/177 | Letter from Georg Balthasar Neumayer, Frankenthal to [Charles] Pasley | 14 November 1865 |
| MS/257/3/184 | Letter from Georg Balthasar Neumayer, 11 Gower Street to Edward Sabine | 26 March 1868 |
| MS/257/3/181 | Letter from Georg Balthasar Neumayer, Frankenthal to Edward Sabine | 27 May 1867 |
| MC/8 | Volume 8 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1867-1869 |
| MS/257/4/93 | Letter from Edward Sabine to [Georg Balthazar von] Neumayer | August 1865 |
| MS/257/3/188 | Letter from Georg Balthasar Neumayer, Frankenthal to Edward Sabine | 3 June 1870 |
| MS/257/3/173 | Letter from Georg Balthasar Neumayer, Flagstaff [Observatory], Melbourne to Edward Sabine | 16 July 1859 |
| MS/257/3/171 | Letter from Georg Balthasar Neumayer, 69 Queen Street, Melbourne to Edward Sabine | 14 September 1857 |
| MS/257/3/174 | Letter from Georg Balthasar Neumayer, Munich to Edward Sabine | 29 November 1864 |
| MC/24/80 | Letter from John Murray, Challenger Lodge, Wardie, Edinburgh, to Mr [Robert] Harrison, [Royal Society] | 23 July 1900 |
| MC/23/318 | Letter from Dr [Georg Balthasar von] Neumayer, 7 Hohenzollernstrasse, Neustadt, to Professor Robert Harrison, Assistant Secretary, Royal Society | 7 November 1908 |
| MC/23/319 | Letter from Dr [Georg Balthasar von] Neumayer, 7 Hohenzollernstrasse, Neustadt, to Professor Robert Harrison, Assistant Secretary, Royal Society, Burlington House, London | 19 November 1908 |
| NLB/38/810 | Copy letter from Robert William Frederick Harrison, to Dr Georg von Neumayer, Foreign Member of the Royal Society | 9 November 1908 |
| MC/17 | Volume 17 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1897-1899 |
| MC/20/237 | Letter from [Georg Balthasar von] Neumayer, to the Royal Society | 14 April 1905 |
| NLB/30/613 | Copy letter from Robert William Frederick Harrison, to Professor Georg Balthasar von Neumayer, Foreign Member, Royal Society | 18 April 1905 |
| MC/20/238 | Letter from [Georg Balthasar von] Neumayer, to Robert [William Frederick] Harrison, Assistant Secretary of the Royal Society, London | 25 April 1905 |
| MC/20 | Volume 20 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1905 |