GSL/L/R/2/257 | Letter from the ROYAL INSTITUTION | 11 Jan 1837 | |
GSL/L/R/3/215 | Letter from the ROYAL INSTITUTION | 10 Jan 1838 | |
GSL/L/R/8/88 | Letter from the ROYAL INSTITUTION | 5 Jan 1844 | |
GSL/L/R/9/236 | Letter from the ROYAL INSTITUTION | 6 Mar 1846 | |
GSL/L/R/9/272 | Letter from William MASON, Royal Institution | 11 Mar 1846 | |
GSL/L/R/11/91a | Letter from the ROYAL INSTITUTION | [1849] | |
GSL/L/R/12/11 | Letter from John BARLOW, Royal Institution | 3 Nov 1851 | |
GSL/L/R/12/62 | Letter from John BARLOW, Royal Institution | 9 Feb 1852 | |
GSL/L/R/12/112 | Letter from John BARLOW, Royal Institution | 8 May 1852 | |
GSL/L/R/12/150 | Letter from John BARLOW, Royal Institution | 3 Sep 1852 | |