| RefNo | Title | Source |
| WP/1/8/32 | S C and F K Cockerell to Alfred Russel Wallace, from Salisbury, Wiltshire | |
| WP/1/8/161 | Sydney S. Cockerell to Alfred Russel Wallace from 29 Friars' Stile Road, Richmond Hill, Surrey | |
| DF/PAL/100/100/1 | Cockerell, Sidney C | |
| WP/1/8/230 | Alfred Russel Wallace to Sydney C. Cockerell from Parkstone, Dorset | |
| WP/1/8/232 | Alfred Russel Wallace to Sydney C. Cockerell from Broadstone, Wimborne | |
| WP/1/8/163 | Sydney C. Cockerell to Alfred Russel Wallace | |
| WP/1/8/233 | Alfred Russel Wallace to Sydney C. Cockerell from Broadstone, Wimborne | |
| WP/16/1/93/2 | Alfred Russell Wallace to Sydney Carlyle Cockerell | |
| WP/16/1/93 | Letter from Rupert Hart-Davis to William Greenell Wallace | |
| DF/MIN/10/2/19 | Spencer G Perceval collection of minerals: correspondence with Sydney C Cockerell and others | |
| WP/1/8/231 | Alfred Russel Wallace to Sydney C. Cockerell from Broadstone, Wimborne | |
| WP/1/1/117 | Letter from Alfred Russel Wallace to his son William Wallace, from Broadstone, Dorset | |
| WP/1/8/162 | Sydney C. Cockerell to Alfred Russel Wallace from 29, Friars' Stile Road, Richmond Hill, Surrey | |
| WP/1/8/164 | Sydney C. Cockerell to Alfred Russel Wallace from 29, Friars' Stile Road, Richmond Hill, Surrey | |
| WP/11/4 | Letter from Sydney C Cockerell to Alfred Russel Wallace | |