Technical Notes National Advisory Committee For Aeronautics No. 503 Measurement Of Altitude In Blind Flying
Washington: 1934. First Edition. Softcover. Complete in original wrapper; mimeo format, stapled (staples may show some rust) ; cover may have some light soiling or staining. Upper corner of cover has presentation stamp from the Committee. Presents tests done at the Langley Memorial Aeronautical Laboratory and elsewhere. More