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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Koekkoek, M. A. (Marianus Adrianus) - Oort, E. D. van (Eduard Daniël),‏ ‎ - Brouwer, Gerrit Anton,
    Publication info: 's-Gravenhage, M. Nijhoff, 1922-35
    Holding Institution: Smithsonian Libraries