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1
The most important clock in America : the David Rittenhouse astronomical musical clock at Drexel University /
by Hoppes, Ronald R, 1935-
Philadelphia : American Philosophical Society, 2009
[2nd enhanced edition].

Book
2
The most important clock in America : the David Rittenhouse astronomical musical clock at Drexel University /
by Hoppes, Ronald R, 1935-
Philadelphia : American Philosophical Society, 2009

Book
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