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David C. Knight
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[CollectionDrop] [immortals-of-science, sabbath-mood-homeschool, upcoming-books, worldwide-books]
Isaac Newton: Mastermind of Modern Science
David C. Knight
Isaac Newton: Mastermind of Modern Science
David C. Knight
[CollectionDrop] [ages-13, immortals-of-science, sabbath-mood-homeschool, upcoming-books, worldwide-books]
Johannes Kepler and Planetary Motion
David C. Knight
Johannes Kepler and Planetary Motion
David C. Knight
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