Collection
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[Model of an X-40 helicopter]
Photograph of an X-40 utility mock up.
Date:
September 29, 1954
Creator:
unknown
System:
The UNT Digital Library
[An X-40 utility mock-up on a tripod]
Photograph of a wooden utility mock-up of a Bell X-40, perched atop a tripod.
Date:
September 29, 1954
Creator:
unknown
System:
The UNT Digital Library