Hedley Colliery (Hedley-on-the-Hill) - 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The information on this website is based on a range of published and unpublished works.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) RCHME Data Exchange 1997 (NMR No: NZ 05 NE 11)
2) 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/]
2a) Ordnance Survey Map OS, 1st edn, 6", Northumberland 104, 1864
2b) Ordnance Survey Map OS, 2nd edn, 6", Northumberland 104 NE, 1898