A "Research Memorandum" published by the National Advisory Committee for Aeronautics (NACA), entitled "Theoretical Investigation Based on Experimental Frequency-Response Measurements of an Automatic Altitude Control in Combination with a Supersonic Missile Configuration," by Ernest C. Seaberg, Edward S. Geller, and William W. Willoughby of the Langley Aeronautical Laboratory, softcover, 7.75 x 10.25, 28 pages, August 3, 1954 (declassified June 20, 1957). In fine condition.
