Civil Aeronautics Board report into the crash of an American Airways flight on 28 December 1934.
Civil Aeronautics Board, US Department of Commerce
1935
US Department of Transportation Special Collection <a rel="nofollow" class="external autonumber" href="http://specialcollection.dotlibrary.dot.gov/Document?db=DOT-AIRPLANEACCIDENTS&amp;query=(select+2)">[1]</a>