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List view record 1: On the Source of the Erratic Boulders in the Valley of River Calder, Yorkshire : A paper read before the Yorkshire Geological and Polytechnic Society, 1879List view anchor tag for record 1: On the Source of the Erratic Boulders in the Valley of River Calder, Yorkshire : A paper read before the Yorkshire Geological and Polytechnic Society, 1879
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