Archaeology

(Cambridge Air Surveys series), b&w aerial photographs of each castle with descriptive and historical text, ground-plans and diagrams, location map, index, x & 246 pp, dark blue boards in d/w, very good condition, Cambridge University Press 1989

27.5 x 21.2 cm, 1050g, ISBN 0 52132 932 9

The Cambridge Committee for Aerial Photography systematically surveyed the British Isles from the air in the years following the last war.  The fact that this photography was in black-and-white is in fact a help here, as features on the ground are more easily visible on a black-and-white photograph, although they may be practically invisible at ground level.

See also the description (below) from the dustwrapper flap. 

Now out of print.