Cup-and-ring-marked outcrop, Howgill Grange, Baldersdale, Hunderthwaite (Baldersdale) - Source of Reference
| No. | Originator(s) | Date | Title | Notes |
|---|---|---|---|---|
| 1 | Durham County Council, Northumberland County Council | 2005 | NADRAP Durham Box File 1 | Rock Art ID # 1728 |
| 2 | Scheduled Monument/Monuments Protection Programme (MPP) Files | Ref: MPP22/AA13567/1 Mon No: 32097 | ||
| 3 | English Heritage, Historic England | Generic Scheduled Monument Notification | 19-Mar-99 |