| Ref No | GB 0809 Ross/163/13/09 |
| Level | Item |
| Title | Note: Calculus of extensions |
| Date | 8/9/1918 |
| Description | Says that Ross started his calculus of extensions about 1890. |
| AccessStatus | Open |
| Language | English |
| Arrangement | Interfiled between pages 15 and 16 of Ross/163/13/08 |