found: Work cat.: The Boulton and Paul "Sidestrand I" bomber airplane (British), [1928].
found: Virtual Aircraft Museum, Oct. 7, 2009:Aircraft directory: UK (Boulton-Paul P.29 Sidestrand, 1926)
found: Wikipedia, Oct. 7, 2009Boulton Paul Sidestrand (Boulton Paul P.29 Sidestrand was a twin-engine biplane medium bomber; first flight 1926; introduced 1928; retired 1936; primary user: Royal Air Force; 20 Sidestrands built. The prototypes designated the Sidestrand Mk I; first six production Sidestrands designated Sidestrand Mk II; remaining 12 aircraft designated the Sidestrand Mk III)
found: Janes Encyclopedia of Aviation, 1996Boulton Paul Sidestrand (a biplane medium bomber for daylight operations, powered by 2 Bristol Jupiter VI or Jupiter VIIIF radial engines (Sidestrand II and III versions respectively))
