Collier's Dene old coal workings (Tillside) - 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The information on this website is based on a range of published and unpublished works.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) Aerial Photograph A/P NU0931 E-O 1980 Mus Antiq Newcastle (T Gates)
(2) Aerial Photograph A/P NU0830 A 1980 Mus Antiq Newcastle (T Gates)
(3) This record includes National Record of the Historic Environment Information provided by Historic England on 4 January 2021 licensed under the Open Government Licence [http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/]
(3a) Vertical aerial photograph reference number RAF CPE/UK/2074 4092-4094 17-MAY-1947
(3b) Vertical aerial photograph reference number NMR OS/72290 0027 11-AUG-197