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Old 6th August 2017, 03:24
Lucy Knight England Lucy Knight is offline
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Join Date: May 2017
Location: Plymouth Devon
Posts: 116
An interesting book called The Secret War by Brian Johnson can be purchased for £ 0.77 plus £2.75 postage and packing Abe books.

It came out 1977 at same time as BBC series.
It covers the struggle called Battle of the Beams. How the system of two beams the Germans used for night time bombing of UK was discovered.

An Interesting read

htps://www.abebooks.co.uk/book-search/title/the-secret-war/author/brian-johnson/sortby/3/
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