Turret 41b (Thorny Doors) (Haltwhistle) - 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The information on this website is based on a range of published and unpublished works.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 1921
2) Richmond, I A, ed 1957. Handbook to the Roman Wall, 11th edition (Newcastle upon Tyne) (148)
3) Birley, E, 1961. Research on Hadrian's Wall (Kendal), (71,74)
4) Field Investigators Comments F1 DK 30-JUN-1966
5) Journal of Roman Studies 58 1968 179
6) Scheduled Monument Notification 14-Jul-1997
7) 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/]
7a) Field Investigators Comments Mark Bowden/08-JAN-1988/RCHME: Hadrian's Wall Project
7b) Watermills and military works on Hadrian's Wall: excavations in Northumberland, 1907-13, by F Gerald Simpson; edited by Grace Simpson (1976) p108
7c) List of Buildings of Special Architectural or Historic Interest, District of Tynedale, Northumberland: 27.7.87 p32
7d) An Archaeological Map of Hadrian's Wall, 1:25,000 scale, English Heritage (2010)