| RefNo | Title | Date |
| MS/222/1 | Letter from William Pengelly, London, to [Arthur] Evans | 29 June 1887 |
| EC/1863/11 | Pengelly, William: certificate of election to the Royal Society | |
| IM/003492 | Pengelly, William | nd |
| MM/17/78 | Letter from Hester Pengelly to Robert Harrison, Assistant Secretary, Royal Society | 30 December 1897 |
| MS/710/81 | Letter from William Pengelly, Lamorna, Torquay, to Robert Were Fox | 19 September 1856 |
| MS/222/16 | Fifty-ninth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 9 November 1870 |
| MS/222/33 | Twenty-eighth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 1 November 1867 |
| MS/222/5 | Second report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 1 June 1865 |
| MS/222/3 | Letter from William Pengelly, Lamorna, Torquay, to Sir Charles Lyell | 1 May 1865 |
| MS/222/7 | Fourth report of progress of excavations by William Pengelly, Torquay, to the British Association Kent's Cavern Committee | 1 August 1865 |
| MS/222/6 | Third report of progress of excavations by William Pengelly, Torquay, to the British Association Kent's Cavern Committee | 1 July 1865 |
| MS/222/2 | Letter from William Pengelly, Lamorna, Torquay, to [Arthur] Evans | 11 July 1887 |
| MS/222/15 | Twelfth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 1 May 1866 |
| MS/222/19 | Fifteenth report of progress of excavations by William Pengelly, Torquay, to the British Association Kent's Cavern Committee | 1 August 1866 |
| MS/222/14 | Eleventh report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 2 April 1866 |
| MS/222/8 | Fifth report of progress of excavations by William Pengelly and Edward Vivian, Lamorna, Torquay, to the British Association Kent's Cavern Committee | 2 October 1865 |
| MS/222/9 | Sixth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 1 November 1865 |
| MS/222/23 | Eighteenth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 3 December 1866 |
| MS/222/40 | Thirty-fifth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 5 June 1868 |
| MS/222/11 | Eighth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 1 January 1866 |
| MS/222/18 | Fourteenth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 2 July 1866 |
| MS/222/21 | Letter from William Pengelly, Lamorna, Torquay, to Charles [Lyell] | 1 October 1866 |
| MS/222/10 | Seventh report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 1 December 1865 |
| MS/222/26 | Twenty-first report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 6 March 1867 |
| MS/222/17 | Thirteenth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 1 June 1866 |
| MS/222/24 | Nineteenth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 3 January 1867 |
| MS/222/36 | Thirty-first report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 3 February 1868 |
| MS/222/12 | Ninth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 1 February 1866 |
| MS/222/25 | Twentieth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 4 February 1867 |
| MS/222/20 | Sixteenth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 1 October 1866 |
| MS/222/22 | Seventeenth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 5 November 1866 |
| MS/222/28 | Twenty-third report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 7 May 1867 |
| MS/222/30 | Twenty-fifth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 8 July 1867 |
| MS/222/27 | Twenty-second report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 8 April 1867 |
| MS/222/29 | Twenty-fourth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 3 June 1867 |
| MS/222/31 | Twenty-sixth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 6 August 1867 |
| MS/222/34 | Twenty-ninth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 2 December 1867 |
| MS/222/37 | Thirty-second report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 2 March 1868 |
| MS/222/39 | Thirty-fourth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 5 May 1868 |
| MS/222/4 | First report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 1 May 1865 |
| MS/222/81 | Seventy-seventh report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 11 July 1872 |
| NLB/9/71 | Copy letter from Theodore E James, to Messrs Harrison & Sons | 22 March 1894 |
| NLB/9/468 | Copy letter from Theodore E James, to Messrs Harrison & Sons | 24 May 1894 |
| NLB/11/684 | Copy letter from Herbert Rix, to Professor Thomas George Bonney, Fellow of the Royal Society | 16 September 1895 |
| NLB/12/502 | Copy letter from Herbert Rix, to Sir Joseph Lister, President of the Royal Society | 2 March 1896 |
| NLB/12/501 | Copy letter from Herbert Rix, to Professor William Boyd Dawkins, Fellow of the Royal Society | 2 March 1896 |
| NLB/15/862 | Copy letter from Robert William Frederick Harrison, to Miss Pengelly, Lamorna, Torquay | 4 January 1898 |
| NLB/15/850 | Copy letter from Robert William Frederick Harrison, to Miss Pengelly | 23 December 1897 |
| NLB/19/172 | Copy letter from Michael Foster, to Miss Hester Pengelly | 7 July 1899 |
| MS/710/82 | Letter from William Pengelly, Lamorna, Torquay, to [Charles Fox?] | 14 May 1860 |
| MS/222 | Reports on excavations at Kent's Cavern by William Pengelly and Edward Vivian | 1865-1880 |
| MS/222/13 | Tenth report of progress of excavations by William Pengelly, to the British Association Kent's Cavern Committee | 6 March 1866 |
| MS/222/32 | Twenty-seventh report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 2 October 1867 |
| MS/222/38 | Thirty-third report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 6 April 1868 |
| MS/222/35 | Thirtieth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 1 January 1868 |
| MS/222/41 | Thirty-sixth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 1 July 1868 |
| MS/222/42 | Thirty-seventh report of progress of excavations by William Pengelly, Torquay, to the British Association Kent's Cavern Committee | 3 August 1868 |
| PT/67/7 | Paper, 'The lignites and clays of Bovey Tracey Devonshire' by William Pengelly | [1861] |
| PT/67/7/2 | Plate, portion of tunnel in pit near fault by unknown artist | [1861] |
| PT/67/7/1 | Manuscript, 'The lignites and clays of Bovey Tracey Devonshire' by William Pengelly | [1861] |
| PT/67/7/4 | Plate, sections of the Bovey formation in plane of strike of the beds by unknown artist | [1861] |
| PT/67/7/3 | Plate, section of the Bovey formation in plane of dip of the beds by unknown artist | [1861] |
| MC/11/447 | Letter from Wm [William] Pengelly, Lamorna, Torquay, to [Thomas Henry Huxley and George Gabriel Stokes], Secretaries of the Royal Society, London | 28 November 1879 |
| MC/11 | Volume 11 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1877-1879 |
| AP/44/10/2 | Unpublished figure, 'Showing the uncomformability of the "head" at the western end of the "coal pit"' by William Pengelly | 1861 |
| AP/44/10/3 | Unpublished figure, strata by William Pengelly | 1861 |
| RR/5/177 | Referee's report by Joseph Prestwich, on a paper 'The lignites and clays of Bovey Tracey, Devonshire' by William Pengelly | March 1862 |
| AP/44/10/1 | Manuscript, 'The lignites and clays of Bovey Tracey, Devonshire [England]' by William Pengelly | 1861 |
| AP/44/10 | Paper, 'The lignites and clays of Bovey Tracey, Devonshire [England]' by William Pengelly | 1861 |
| MC/11/444 | Letter from Wm [William] Pengelly, Lamorna, Torquay, to [Thomas Henry Huxley and George Gabriel Stokes], Secretaries of the Royal Society, London | 25 November 1879 |
| RR/5/176 | Referee's report by Joseph Dalton Hooker, on a paper 'The lignites and clays of Bovey Tracey, Devonshire' by William Pengelly | 4 February 1862 |
| MS/222/43 | Thirty-eighth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 5 October 1868 |
| MS/222/44 | Thirty-ninth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 3 November 1868 |
| MS/222/45 | Fortieth report of progress of excavations by William Pengelly, Torquay, to the British Association Kent's Cavern Committee | 3 December 1868 |
| MS/222/46 | Forty-first report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 7 January 1869 |
| MS/222/47 | Forty-second report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 4 February 1869 |
| MS/222/48 | Forty-third report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 8 March 1869 |
| MS/222/49 | Forty-fourth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 8 April 1869 |
| MS/222/50 | Forty-fifth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 8 May 1869 |
| MS/222/51 | Forty-sixth report of progress of excavations by William Pengelly, Torquay, to the British Association Kent's Cavern Committee | 8 June 1869 |
| MS/222/52 | Forty-seventh report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 10 July 1869 |
| MS/222/53 | Forty-eighth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 9 October 1869 |
| MS/222/54 | Forty-ninth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 6 November 1869 |
| MS/222/55 | Fiftieth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 7 December 1869 |
| MS/222/56 | Fifty-first report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 11 January 1870 |
| MS/222/57 | Fifty-second report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 8 February 1870 |
| MS/222/58 | Fifty-third report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 9 March 1870 |
| MS/222/59 | Fifty-fourth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 12 April 1870 |
| MS/222/60 | Fifty-fifth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 10 May 1870 |
| MS/222/61 | Fifty-sixth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 7 June 1870 |
| MS/222/62 | Fifty-seventh report of progress of excavations by William Pengelly, Torquay, to the British Association Kent's Cavern Committee | 6 July 1870 |
| MS/222/63 | Fifty-eighth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 10 August 1870 |
| MS/222/64 | Sixtieth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 9 December 1870 |
| MS/222/65 | Sixty-first report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 11 January 1871 |
| MS/222/66 | Sixty-second report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 2 February 1871 |
| MS/222/67 | Sixty-third report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 2 March 1871 |
| MS/222/68 | Sixty-fourth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 10 April 1871 |
| MS/222/69 | Sixty-fifth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 8 May 1871 |
| MS/222/70 | Sixty-sixth report of progress of excavations by William Pengelly, Torquay, to the British Association Kent's Cavern Committee | 6 June 1871 |
| MS/222/71 | Sixty-seventh report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 6 July 1871 |
| MS/222/72 | Sixty-eighth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 12 September 1871 |
| MS/222/73 | Sixty-ninth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 10 October 1871 |
| MS/222/74 | Seventieth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 7 November 1871 |
| MS/222/75 | Seventy-first report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 9 December 1871 |
| MS/222/76 | Seventy-second report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 9 January 1872 |
| MS/222/77 | Seventy-third report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 12 February 1872 |
| MS/222/78 | Seventy-fourth report of progress of excavations by William Pengelly, Torquay, to the British Association Kent's Cavern Committee | 12 March 1872 |
| MS/222/79 | Seventy-fifth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 9 April 1872 |
| MS/222/80 | Seventy-sixth report of progress of excavations by William Pengelly and Edward Vivian, Torquay, to the British Association Kent's Cavern Committee | 12 June 1872 |