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  1. Knowledge of natural history, rev. from Reason why: natural history, giving reasons for hundreds of interesting facts in connection with zoology; and throwing light upon the peculiar habits and instincts of the various orders of t
    By: Philp, Robert Kemp,
    Publication info: Cincinnati, O.,J.B. Sanders & company[c1916]
    Contributed by: Library of Congress
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  2. The reason why, natural history giving reasons for hundreds of interesting facts in connection with zoology : and throwing light upon the peculiar habits and instincts of the various orders of the animal kingdom / by the author of "The Biblical reason why"
    By: Philp, Robert Kemp, - Making of America Project.
    Publication info: New York :Dick & Fitzgerald,c1860
    Contributed by: University of California Libraries (archive.org)
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  3. The reason why: a careful collection of many hundreds of reasons for things which, though generally believed, are imperfectly understood. A book of condensed scientific knowledge for the million. By the author of "Inquire within".
    By: Philp, Robert Kemp,
    Publication info: New York :Dick & Fitzgerald,[1857?]
    Contributed by: University of California Libraries (archive.org)
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  4. The reason why: a careful collection of many hundreds of reasons for things which, though generally believed, are imperfectly understood. A book of condensed scientific knowledge ... By the author of "Inquire within".
    By: Philp, Robert Kemp,
    Publication info: New York,Dick & Fitzgerald[1867?]
    Contributed by: University of California Libraries (archive.org)
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