Curving linear earthwork, Billing Hills, Eastgate (Eastgate) - Source of Reference
| No. | Originator(s) | Date | Title | Notes |
|---|---|---|---|---|
| 1 | Ordnance Survey | Ordnance Survey Archaeology Card AKA National Non-Intensive Archaeological Record (England) | NY93NE15 | |
| 2 | Hildyard, E J W, Snowdon, G V | 1955 | Archaeology of Weardale: sixth summary of research, 1950-52 | pp. 2-3 |
| 3 | Vyner, B | Eastgate, Billing Hills | ||
| 4 | Smith, D | David Smith DS Field Investigators Comments | F1 DS 28.06.57 | |
| 5 | Davidson, J L | 24-Oct-1951 to 31-Mar-1983 | James Love Davidson (JLD) Ordnance Survey Archaeology Officer | F2 JLD 2.7.57 |