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1.
The most important clock in America : the David Rittenhouse astronomical musical clock at Drexel University / Ronald R. Hoppes. by Series: Transactions of the American Philosophical Society ; v. 99, pt. 2.
Edition: [2nd enhanced edition].
Material type: Text Text; Format: print ; Literary form: Not fiction
Publisher: Philadelphia : American Philosophical Society, 2009Copyright date: ©2009
Availability: Items available for loan: Jost Bürgi Library (1)Call number: TS543.5.P4 H67 2009.
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2.
The David Rittenhouse clock at Drexel / author: Ronald R. Hoppes ; photos and movement gear counts by Bruce Forman. by
Edition: Limited edition.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publisher: Royersford, PA : The author, 2008
Availability: Items available for loan: Jost Bürgi Library (1)Call number: TS543.5.P4 H677 2008.
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