| Repository | Jesuits in Britain Archives |
| Ref No | ABSI/SJ/51/6/44 |
| Title | Levels, shells and rings |
| Date | nd |
| Level | File |
| Description | Notes on: reduced coordinates, levels, shells and shell distance. |
| Format | Manuscript |
| AccessConditions | The papers are available subject to the usual conditions of access to archive material in the Jesuits in Britain Archives. |