References for the 'Deal Area in Maps' talk are as follows:
1797 Mudge field sketches 3 inch to 1 mile - British Library Online Gallery -
Covers Dover to Sandwich to Eastry, excellent resolution
http://www.bl.uk/onlinegallery/onlineex/ordsurvdraw/s/002osd000000006u00368000.html
1815 Modified Mudge map - British Library online Gallery -
Covers inland to Canterbury, but at lower resultion online.
http://www.bl.uk/onlinegallery/onlineex/ordsurvdraw/c/002osd000000017u00367000.html
1820 OS East Kent 1 inch to 1 mile - Vision of Britain -
http://visionofbritain.org.uk/maps/results.jsp?xCenter=3420359.33904&yCenter=2749777.49685&scale=63360&mapLayer=nineteenth&subLayer=first_edition&title=Ordnance%20Survey%20and%20Ordnance%20Survey%20of%20Scotland%20First%20Series
1871 Deal 25 inch to 1 mile. Use the Godfrey edition and a magnifying glass.
Available from Tylers or other book shops very reasonably priced.
1906 OS revision at Deal Library 2500:1 scale
Alan Buckman