Promontory Fort and boundary (Horncliffe) - Source of Reference
The information on this website is based on a range of published and unpublished works. Below is a list of the source of information used in writing this record.
(1) Ordnance Survey Map 25 inch 1963
(2) Field Investigators Comments F1 WDJ 19-DEC-1962
(3) Field Investigators Comments F2 ECW 18-MAY-1967
(4) Oral information, correspondence or staff comments, D Adams, 05-Dec-1994
(5) Infra red line scan 2RAF3220 281439:31ZSEP94 RSTGT UNCLASSIFIED NT918490