Cropmarks at Number One Industrial Estate, Leadgate - Source of Reference
| No. | Originator(s) | Date | Title | Notes |
|---|---|---|---|---|
| 1 | Durham County Council Archaeology Section | to 2012 | 1:10560 SMR Map Overlay | |
| 2 | Bowes Museum Aerial Photograph Collection | NCB FA (National Coal Board FA?) | ||
| 3 | DCC | Durham County Council SMR Card | NZ 15 SW 28 | |
| 4 | Boldrini, N | 2026 | Comment by Nicholas Boldrini, HER Officer DCC 2026 | 29/06/2026 |
| 5 | 1970 to 1979 | Seventh Epoch Ordnance Survey Map | ||
| 6 | 1980 to 1994 | Eighth Epoch Ordnance Survey Map |