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Most Important Clock in America: The David Rittenhouse Astronomical Musical Clock at Drexel University: Transactions, American Philosophical Society ... of the American Philosophical Society): Ronald R. Hoppes: 9781606189924: Amazon.com: Books
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Keeping Time: 5 Essential Clocks for Any Collection, Antiques, Expert Insights - From the Library at M.S. Rau, Since 1912.
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