Cup-marked boulder, Howgill Grange, Baldersdale, Hunderthwaite (Romaldkirk) - Source of Reference
| No. | Originator(s) | Date | Title | Notes |
|---|---|---|---|---|
| 1 | Pickin, J | 1993 | Rock Art Survey | |
| 2 | 1998 to 1999 | Monuments Protection Programme (MPP) County Durham Accelerated Scheduling Programme Folder: Area 4 Baldersdale Northside | AI Reference Number: 148710 Date of Visit: 07/01/1998 | |
| 3 | English Heritage, Historic England | Generic Scheduled Monument Notification | 19-Mar-99 |