YB-17 Flying Fortress at Langley Field, Virginia
Color close-up picture of a Boeing YB-17 bomber with the Wright R-1820-39 Cyclone engines running, and with the early version of nose gun turret. (Library of Congress)

YB-17 at Langley Field, Virginia

YB-17 Flying Fortress at Langley Field, Virginia
Color close-up picture of a Boeing YB-17 bomber with the Wright R-1820-39 Cyclone engines running, and with the early version of nose gun turret. (Library of Congress)

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