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  1. Hidden beauties of nature.
    By: Kerr, Richard.
    Edition: 2d ed.
    Publication info: London,The Religious Tract Society,1900.
    Holding Institution: University of California Libraries (archive.org)
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  2. Nature through microscope & camera
    By: Kerr, Richard.
    Publication info: London,The Religious Tract Soc.,1909.
    Holding Institution: University of California Libraries (archive.org)
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