Keywords: Northrop XBT-1 and BT-1 silhouettes.png en Silhouette side view of Northrop XBT-1 and BT-1 dive bombers VectorSite Greg Goebel<br>Originally uploaded to en wikipedia by Aerobird at 03 28 1 February 2007 UTC 2007 All VectorSite images marked GVG/PD are In The Public Domain Greg Goebel Northrop BT Images by Greg Goebel |