Mill Pit (Seaton Valley) - 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The information on this website is based on a range of published and unpublished works.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) Tomlinson, W W 1915. Old Hartley Colliery, Proceedings of the Society of Antiquaries of Newcastle upon Tyne 3rd series 7(6), 73-82