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  1. The economy of nature explained and illustrated on the principles of modern philosophy, by G. Gregory.
    By: Gregory, G.
    Edition: 2d. ed., with considerable additions.
    Publication info: London :J. Johnson,1798.
    Contributed by: University of California Libraries (archive.org)
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  2. Lectures on experimental philosophy, astronomy, and chemistry; intended chiefly for the use of students and young persons, by G. Gregory.
    By: Gregory, G.
    Edition: 2d ed., corr. and improved.
    Publication info: London,printed for Longman,1820.
    Contributed by: University of California Libraries (archive.org)
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