Mauboussin M-10 photo from NACA Aircraft Circular No.145
NACA Aircraft Circular
<a rel="nofollow" class="external free" href="https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930090436.pdf">https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930090436.pdf</a>