Shooting the Front by Col Terrence J Finnegan - Allied Air Reconnaissance in the First World War.

'One Flight Too Many' by Jimmy Taylor - An autobiography of a PR Spitfire Pilot.

'Evidence in Camera' by Constance Babington Smith - The Story of Photographic Intelligence in the Second World War.

'Women of Intelligence' by Christine Halsall - The story of Women Photographic Interpreters during World War II.

'Eyes of the RAF' by Roy Conyers Nesbit - A History of Photo-reconnaissance.

'Above All Unseen' by Edward Leaf - Royal Air Force's Photographic Reconnaissance Operations, 1939-45.

'World War Two Photo Intelligence' by Colonel Roy M Stanley II, USAF - 1981. ISBN 0-684-17016-7. Out of Print.

'V Weapons Hunt' by Colonel Roy M Stanley II, USAF - Defeating German Secret Weapons.

'The Eye of Intelligence' by Ursula Powys-Lybbe - 1983. ISBN 0-7183-0468-3. Now out of print.

'Spies In The Sky' by Taylor Downing - The Secret Battle for Aerial Intelligence during World War II.

'The Western Front from the Air' by Nicholas C Watkis - Exquisite air photography taken during the First World War offers readers the chance to view military conditions from the point of view of an Intelligence Officer.

'Looking Down the Corridors' by Kevin Wright, Peter Jefferies - Allied Aerial Espionage Operations over East Germany and Berlin, 1945-1990