| RefNo | Title | Date |
| IM/Maull/004861 | Whitaker, William | nd |
| NLB/1/742 | Copy letter from Herbert Rix, to William Whitaker | 25 November 1887 |
| NLB/4/34 | Copy letter from Herbert Rix, to William Whitaker, Fellow of the Royal Society, 22 East Park Terrace, Southampton | 23 January 1890 |
| NLB/16/29 | Copy letter from Theodore E James, to Messrs Harrison & Sons | 17 January 1898 |
| NLB/7/672 | Copy letter from Herbert Rix, to William Whitaker, Fellow of the Royal Society | 8 April 1893 |
| NLB/10/547 | Copy letter from Herbert Rix, to William Whitaker, Fellow of the Royal Society | 14 December 1894 |
| NLB/13/599 | Copy letter from Theodore E James, to Messrs Harrison & Sons | 14 October 1896 |
| NLB/19/98 | Copy letter from Robert William Frederick Harrison, to William Whitaker, Fellow of the Royal Society, Freda, Campden Road, Croydon | 19 June 1899 |
| NLB/16/901 | Copy letter from Robert William Frederick Harrison, to W Whitaker, Fellow of the Royal Society | 29 June 1898 |
| NLB/22/451 | Copy letter from Robert William Frederick Harrison, to [William] Whitaker, Fellow of the Royal Society | 17 May 1901 |
| NLB/20/590 | Copy letter from Robert William Frederick Harrison, to Dr Thomas Edward Thorpe, Sir Clements Markham, Lord Kelvin [William Thomson], Professor Oliver Joseph Lodge, and William Whitaker, [Fellow of the Royal Society] | 25 May 1900 |
| NLB/21/578 | Copy letter from Robert William Frederick Harrison, to William Whitaker, Fellow of the Royal Society, President of the Geologists's Association | 12 December 1900 |
| MC/19/847 | Letter from [William] Whitaker, Freda, Campden Road, Croydon, to [Robert William Frederick] Harrison | 4 February 1904 |
| NLB/28/237 | Copy letter from Robert William Frederick Harrison, to William Whitaker, Fellow of the Royal Society | 3 February 1904 |
| NLB/30/461 | Copy letter from Robert William Frederick Harrison, to William Whitaker, Fellow of the Royal Society | 28 March 1905 |
| NLB/37/28 | Copy letter from Robert William Frederick Harrison to W [William] Whitaker FRS | 13 January 1908 |
| NLB/39/676 | Copy letter from Robert William Frederick Harrison to W [William] Whitaker, Fellow of the Royal Society | 22 February 1909 |
| NLB/39/371 | Copy letter from Robert William Frederick Harrison to W [William] Whitaker, Fellow of the Royal Society | 12 January 1909 |
| NLB/39/370 | Copy letter from Robert William Frederick Harrison to The Secretary, Kings College | 12 January 1909 |
| NLB/39/660 | Copy letter from Joseph Larmor to W [William] Whitaker, Fellow of the Royal Society | 20 February 1909 |
| NLB/39/684 | Copy letter from Robert William Frederick Harrison to W [William] Whitaker, Fellow of the Royal Society | 24 February 1909 |
| NLB/41/334 | Copy letter from Robert William Frederick Harrison, to William Whitaker, Fellow of the Royal Society | 22 November 1909 |
| NLB/41/385 | Copy letter from Robert William Frederick Harrison, to William Whitaker, Fellow of the Royal Society | 3 December 1909 |
| NLB/41/396 | Copy letter from Robert William Frederick Harrison, to William Whitaker, Fellow of the Royal Society | 7 December 1909 |
| NLB/42/434 | Copy letter from Robert William Frederick Harrison to W [William] Whitker FRS, 3 Camden Road, Croyden, Chairman of the Sectional Committee for Geology | 10 June 1910 |
| NLB/50/752 | Copy letter from Robert William Frederick Harrison, to [William] Whitaker, Fellow of the Royal Society | 30 October 1914 |
| NLB/58/168 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to William Whitaker Esquire, FRS | 22 March 1920 |
| NLB/55/487 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to [William] Whitaker Esq., FRS | 26 April 1918 |
| NLB/55/46 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to [William] Whitaker Esq., FRS | 15 November 1917 |
| NLB/65/870 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to [William] Whitaker Esq, FRS | 21 January 1924 |
| NLB/67/733 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr [John Smith] Flett, FRS | 24 February 1925 |
| NLB/67/626 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Aubrey Strahan, KBE, FRS | 2 February 1925 |
| NLB/67/660 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Aubrey Strahan, KBE, FRS | 10 February 1925 |
| NLB/68/137 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to H. S. Whitaker Esq.; Wellesley Court Club, Wellesley Road, Croydon | 19 May 1925 |
| NLB/67/579 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [George William] Lamplugh, FRS | 23 January 1925 |
| EC/1887/17 | Whitaker, William: certificate of election to the Royal Society | |
| NLB/12/203 | Copy letter from Herbert Rix, to William Whitaker, Fellow of the Royal Society, 33 East Park Terrace, Southampton | 3 January 1896 |
| MC/14/273 | Letter from [William Whitaker], Southampton, to [Herbert] Rix | 27 November 1887 |
| MC/19 | Volume 19 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1904 |