| Reference number | MC/1/173b |
| Level | Item |
| Title | Letter from Thomas Colby, Lieutenant Colonel, Ordnance Survey Office, to General Mann |
| Date | 24 August 1829 |
| Description | Copy letter regarding measurements for the ordnance survey on Loch [Lough] Foyle near Magilligan. Contains table of areas and their respective proprietors and lease details.
Enclosed with related record. |
| Extent | 3p |
| Format | Manuscript |
| Access status | Open |
| Related records in the catalogue | MC/1/173a |