Mill Hill - earthwork, cropmark (Duddo) - 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The information on this website is based on a range of published and unpublished works.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) Externally held archive reference RCAHMS NMR Archive Card
1a) Aerial photograph APs (XS/519-20/po (Harding 78/007/2,3))
2) Oral information, correspondence or staff comments, C Hardie, 13-Feb-1991
3) Aerial Archaeology 7 1981 34 (T Gates)
4) Universities of Durham and Newcastle upon Tyne Archaeological Report 5 for 1981 2 (T Gates)
5) English Heritage: Till Tweed NMP, Air Photograph Interpretation, 27 Mar 2003 - 29 Sep 2003 (UID 1405)
6) 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/]
6a) Oblique aerial photograph reference number NMR NT 8943/6 (1974/259) 29-JUN-1981
6b) Oblique aerial photograph reference number NMR NT 8943/14 (16642/33) 02-AUG-1996