Kansas City, Kansas. B-25 bombers on the flight ramp ready for a test flight at the North American Aviation, Inc.

Kansas City, Kansas. B-25 bombers on the flight ramp ready for a test flight at the North American Aviation, Inc.

Kansas City, Kansas. A B-25 bomber on the final assembly line at North American Aviation Inc.

Kansas City, Kansas. A B-25 bomber on the final assembly line at North American Aviation Inc.

Kansas City, Kansas. B-25 bombers lined up at North American Aviation, Inc., almost ready for their first test flight

Kansas City, Kansas. B-25 bombers lined up at North American Aviation, Inc., almost ready for their first test flight

Kansas City, Kansas. B-25 bombers and tractors that haul them on the assembly line at North American Aviation, Inc. The planes are ready for their first test flight

Kansas City, Kansas. B-25 bombers and tractors that haul them on the assembly line at North American Aviation, Inc. The planes are ready for their first test flight

A mill operator in North American Aviation's huge machine shop turns out another of the thousands of parts for modern combat planes. All scrap metal is sent to salvage plant

A mill operator in North American Aviation's huge machine shop turns out another of the thousands of parts for modern combat planes. All scrap metal is sent to salvage plant

Rudder controls are assembled by men and women on North American Aviation's P-51 fighter final assembly line

Rudder controls are assembled by men and women on North American Aviation's P-51 fighter final assembly line

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The Men and Women of North American Aviation: 1942