Sikorsky YR-4B
Tuesday, March 26, 2019 by Sarah Sundin
Sikorsky YR-4B at NACA Langley Memorial Aeronautical Laboratory, Hampton, VA, 29 March 1945 (NASA Langley photo: EL-2003-00296)
Sikorsky YR-4B at NACA Langley Memorial Aeronautical Laboratory, Hampton, VA, 29 March 1945 (NASA Langley photo: EL-2003-00296)
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