Nieuport-Delage NiD.590 Col.3 Colonial Transport drawing
NACA
NACA report on aircraft at <a rel="nofollow" class="external free" href="http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930090480.pdf">http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930090480.pdf</a>