Douglas DC-5 3-view drawing from L'Aerophile August 1939
L'Aerophile magazine
1939-08-01
<a rel="nofollow" class="external free" href="http://gallica.bnf.fr/ark:/12148/bpt6k65551725?rk=236052;4">http://gallica.bnf.fr/ark:/12148/bpt6k65551725?rk=236052;4</a>