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Wulff, J. Jepson; Leonard, Jon N.; Pixley, Alden F. Listings

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1 Wulff, J. Jepson; Leonard, Jon N.; Pixley, Alden F. A Descriptive Model for Determining Optimal Human Performance in Systems, Volume I (NASA CR-976)
Washington, D.C. National Aeronautics and Space Administration 1968 First Edition Soft Cover Very Good- 

159 pp., mathematical formulae, 9 figures, references. A NASA Contractor Report in green wraps. Some edgewear, 1/4" tear along edge, bottom edge sunned.

Part A: "A Simple Model of a Man-Machine Development Cycle."
Part B: "A Simple Calculus for Discrete Systems."; 4to - over 9" - 12" tall
Price: 15.00 USD

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