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  1. 1
    Guide to the geology of Cornwall, Pennsylvania,

    Guide to the geology of Cornwall, Pennsylvania, by Gray, Carlyle

    Published 1961
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  2. 2
    Geology and origin of the Triassic magnetite deposit and diabase at Cornwall, Pennsylvania /

    Geology and origin of the Triassic magnetite deposit and diabase at Cornwall, Pennsylvania / by Lapham, Davis M.

    Published 1973
    Other Authors: “…Gray, Carlyle…”
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