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000172175 1001_ $$aEthell, Jeffrey L.
000172175 24510 $$aFuel economy in aviation /$$cJeffrey L. Ethell.
000172175 260__ $$aWashington, DC :$$bScientific and Technical Information Branch, National Aeronautics and Space Administration :$$bFor sale by the Supt. of Docs., U.S. G.P.O.,$$c1983.
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000172175 61020 $$aAircraft Energy Efficiency Program (U.S.)
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