Civil Aeronautics Board report into the incident involving Pan American Flight 320 on 23 September 1941.
Civil Aeronautics Board, US Department of Transportation
1942-05-06
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+112)">[1]</a>