Civil Aeronautics Board report into the incident involving Delta Airlines Flight 3 on 22 December 1941.
Civil Aeronautics Board, US Department of Commerce
1941-07-31
US Department of Transportation Special Collections <a rel="nofollow" class="external autonumber" href="http://specialcollection.dotlibrary.dot.gov/Document?db=DOT-AIRPLANEACCIDENTS&amp;query=(select+103)">[1]</a>