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"An Aviator's Field Book" from Oswald Boelcke. German flying ace of the First World War and one of the most influential patrol leaders and tacticians of the early years of air combat (1891-1916).
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.