Evidence in Camera : Constance Babington Smith. History of Military Aerial Surveillance

First published in 1957 this is the 1961 paperback  edition.
Complete, 239 pages all intact with some foxing to the page edges. The author worked with the Allied Central Interpretation Unit during the Second World War 
It tells the story of the development of photographic intelligence gathering during the war years and records the contributions made by the key characters.

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