Books by A. Harper Gerringer:
Books in the extended shelves:
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Gerringer, A. Harper: An Experimental and analytical investigation of the natural frequencies and mode shapes of a four-stage solid-propellant rocket vehicle / Sumner A. Leadbetter, Vernon L. Alley Jr., Robert W. Herr and A. Harper Gerringer. (National Aeronautics and Space Administration :, 1962), also by Sumner A. Leadbetter, Robert W. Herr, Vernon L. Alley, and United States National Aeronautics and Space Administration (page images at HathiTrust)- Gerringer, A. Harper: A Matrix method for the determination of the natural vibrations of free-free unsymmetrical beams with application to launch vehicles. Vernon L. Alley Jr. and A. Harper Gerringer. (National Aeronautics and Space Administration :, 1962), also by Vernon L. Alley and United States National Aeronautics and Space Administration (page images at HathiTrust)
Find more by A. Harper Gerringer at your library, or elsewhere.