POPULAR AVIATION 6/1940~STEARMAN PT-13~LAWS OF AERIAL WARFARE~Allies buy planes For Sale

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POPULAR AVIATION 6/1940~STEARMAN PT-13~LAWS OF AERIAL WARFARE~Allies buy planes :
$5.99

POPULAR AVIATION magazine 6/1940~with a cover photo of the STEARMAN PT-13 plane~cover featured stories on the LAWS OF AERIAL WARFARE~Allies buy U.S. warplanes (Billion Dollar Shopping Tour)~Mystery Airfoil~The Deadly Show - off.
And lots more. Plus a fashionable back cover ad for Lockheed. (See scans.)