Arvo Vercamer
Pullman, Washington, USA
Thanks to Avro Vercamer for sharing his research.
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William Greene and John Fricker
"The Air Forces of the World"
Hannover House Press, New York, New York, USA, 1958
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League of Nations
"Armaments Year-Book - 1938"
Official Publication Number: C.206.M.112.1938.IX;
Geneva, Switzerland,1938
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