4 Group Bomber Command : an operational record
Chris Ward (Author)
During the immediate period before World War Two, the RAF modified its command structure to rationalize for rapid expansion. Bomber Command was divided into six operational groups, each flying the same type of aircraft, including Wellingtons and Lancasters. Ward explores the history of 4 Group Bomber Command
Print Book, English, 2012
Pen & Sword Aviation, Barnsley, South Yorkshire, 2012