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{{Bibliographic Record
|Title=The Impact of Uniformitarianism: Two Letters from John Herschel to Charles Lyell, 1836-37
|Resource Type=journal article
|Author=Susan Faye (born Walter Faw) Cannon
|Year=1961
|Journal=Proceedings of the American Philosophical Society
|Volume=105
|Number=3
|Pages=310-314
}}