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Observations on the Trap Rocks of the Connewago Hills near Middletown, Dauphin County, and of the Stony Ridge near Carlisle, Cumberland County, Pennsylvania

John B. Gibson
Transactions of the American Philosophical Society
Vol. 2 (1825), pp. 156-166
DOI: 10.2307/1005056
Stable URL: http://www.jstor.org/stable/1005056
Page Count: 11
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Observations on the Trap Rocks of the Connewago Hills near Middletown, Dauphin County, and of the Stony Ridge near Carlisle, Cumberland County, Pennsylvania
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