1 2 3 Pratt & Whitney R-2800 page Retrieved: 25 October 2008 ↑ "B-29 Design/Devemopment - Engines". http://www.468thbombgroup.org. Retrieved August 1, 2013. External link in |website= (help) Cite web URL http://www.468thbombgroup.org/LinkClick.aspx?fileticket=sPINPiUsDfI%3D&tabid=36&mid=467 Title B-29 Design/Devemopment - Engines Last name <!--Staff writer(s); no by-line.--> Authors list <!--Staff writer(s); no by-line.--> Website http://www.468thbombgroup.org URL access date August 1, 2013 ↑ McCutcheon, Kimble.