Escape from Germany - The Second World War 1939-1945 Royal Air Force - Confidential C.D. 1073
Air Ministry - hardcover, with dustjacket - very good - uitmuntende staat - afterwards, 1966, changed in Restricted by Ministry of Defence - 351 pp + folding map, 1951 1e druk.
Bracknell, Bellona - very good - vrijwel NIEUWSTAAT - A reprint and translation of Bildheft Neuzeitlicher Stellungsbau, originally published in German in 1943 - 78 pag, 1969 2e druk.