Northwest Airlines, Inc., Boeing 377, N74608, in puget sound, near Seattle, Washington, April 2, 1956
Civil Aeronautics Board, US Department of Commerce
1956-11-14
US Department of Transportation Special Collections <a rel="nofollow" class="external autonumber" href="http://dotlibrary.specialcollection.net/Document?db=DOT-AIRPLANEACCIDENTS&amp;query=(select+623)">[1]</a>