Pilots Instrument Panel
Civil Aeronautics Board
1943
<a class="external free" href="https://en.wikisource.org/wiki/Page:Aviation_Accident_Report,_American_Export_Airlines_Flight_71.pdf/17">https://en.wikisource.org/wiki/Page:Aviation_Accident_Report,_American_Export_Airlines_Flight_71.pdf/17</a>