Birtley pits (Birtley) - 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The information on this website is based on a range of published and unpublished works.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) Hall, G.R., 1876. Archaeologia Aeliana (2nd Series) 7, 10.
(2) Field Investigators Comments F1 ASP 20-APR-1956
(3) Oral information, correspondence or staff comments E. Williams
(4) 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/]
(4a) English Heritage Monuments Protection Programme Industrial Monuments Assessment, Step 3 Reports, Instone, E., for the Monuments Protection Programme 1995: The Iron Mining Industry, Volume Four