Bureau of Air Commerce (part of the U.S. Department of Commerce, U.S. Federal Government) report into the investigation of the crash of a TWA flight on 26 January 1935.
Bureau of Air Commerce
1935-03-28
National Transportation Library, U.S. Department of Transportation. <a rel="nofollow" class="external free" href="https://rosap.ntl.bts.gov/view/dot/32944">https://rosap.ntl.bts.gov/view/dot/32944</a>