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Sources

The locations of defensive works in England are based on information in

various books listed below, but also and principally on the Defence of

Britain database, the result of several years of research by volunteers and of

cataloguing and data entry by workers based at the Imperial War Museum,

Duxford. The site is at http://ads.ahds.ac.uk/catalogue/specColl/dob. The

works are classified by type of structure which did not suit my needs in con-

structing possible events in specific locations and I was guided to the

appropriate methodology by Dr William Kilbride, User Services Manager,

Archaeology Data Service. As he pointed out, the method described throws

up all sites of any age in a given area and it is necessary to weed out those

not wanted, but I found it very much the best approach and also came upon

things irrelevant to my task but fascinating in their own right, which was

fun.