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  1. Celestial mechanics. A survey of the status of the determinationof the general perturbations of the minor planets, by A. O. Leuschner.
    By: National Research Council (U.S.). Committee on Celestial Mechanics. - Leuschner, Armin Otto,
    Publication info: Washington, D. C. :Published by the National research council of the National academy of sciences,1922.
    Holding Institution: University of California Libraries (archive.org)
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