found: Work cat.: Hall, A.W. Handley Page Hampden and Hereford, 2006:p. 22 (twin-engined day and night bomber, later torpedo bomber; manufacturer's designation HP.52) p. 7 (a later variant with different engines became known as the Handley Page Hereford)
found: Wikipedia, 21 Apr. 2006:Handley Page Hampden (the Handley Page HP.52 Hampden was a twin-engine medium bomber; a front-line bomber of the RAF at the start of World War II; variant Hereford)
found: Royal Air Force Museum web site, 21 Apr. 2006:London Collections aircraft (Handley Page Hampden; the Hampden bore the brunt of the RAF's attacks against Germany in the early years of the Second World War)
found: British Aircraft directory web site, 21 Apr. 2006:Handley Page (Hampden and Hereford)
