Combs Round sheepfold, Hunderthwaite (Baldersdale) - Source of Reference
| No. | Originator(s) | Date | Title | Notes |
|---|---|---|---|---|
| 1 | Wilcock, D | 1996 to 1998 | IRIS (Index Record for Industrial Sites) Survey Archive | 81008 |
| 2 | Wilcock, D | 1998 | Durham County Sheepfolds & Shelters | |
| 3 | Ordnance Survey | 1856 to 1865 | First Edition Ordnance Survey Map | 6", Yorkshire 4, 1856; IRIS gives 6" Yorkshire 4, 1854 |
| 4 | Ordnance Survey | 1894 to 1899 | Second Edition Ordnance Survey Map | 6", Yorkshire 4 SW, 1919 |
| 5 | Newcastle City Archaeology Unit, Truman, L | 01-Jan-1994 to 31-Dec-1994 | RCHME: North Pennines Industrial Archaeology Project |