Turret 46a (Greenhead; Thirlwall) - 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The information on this website is based on a range of published and unpublished works.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 of Hadrian's Wall 1964
2) Birley, E, 1961. Research on Hadrian's Wall (Kendal), (71,75)
3) Field Investigators Comments F1 RWE 24-AUG-1966
4) Scheduled Monument Notification 14-Jul-1997
5) 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/]
5a) Field Investigators Comments Keith Blood/02-MAR-1988/RCHME: Hadrian's Wall Project
5b) List of Buildings of Special Architectural or Historic Interest, District of Tynedale, Northumberland: 27.7.87, p94
5c) An Archaeological Map of Hadrian's Wall, 1:25,000 scale, English Heritage (2010)