Description:
By Harold S. Wilson, CEng: Published in August 1990 by the British Philatelic Trust, 107 Charterhouse Street, London EC1M 6PT, in conjunction" with the Derbyshire Postal History Society, at ?22 plus postage (?3 inland: ?4.50 overseas); A4, 290 + vi pp, soft bound with laminated colour cover; ISBN 1-871777-05-4.