Backside Fell (2) (Harwood in Teesdale) - Source of Reference
| No. | Originator(s) | Date | Title | Notes |
|---|---|---|---|---|
| 1 | Wilcock, D | 1996 to 1998 | IRIS (Index Record for Industrial Sites) Survey Archive | 73003 |
| 2 | Wilcock, D | 1998 | Personal comment by Don Wilcock 1998 | |
| 3 | Ordnance Survey | 1856 to 1865 | First Edition Ordnance Survey Map | |
| 4 | Ordnance Survey | 1894 to 1899 | Second Edition Ordnance Survey Map |