U. S. Secretary of Commerce statement re: the crash of a TWA flight on 6 May 1935
Civil Aeronautics Bureau
1935-06-14
National Transportation Library, U.S. Department of Transportation. <a rel="nofollow" class="external free" href="https://rosap.ntl.bts.gov/view/dot/32941">https://rosap.ntl.bts.gov/view/dot/32941</a>