The Hudson Valley in the Ice Age: a Geological History and Tour
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The Catskills in the Ice Age, Revised Edition
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The Other Side of Time: Essays by "The Catskill Geologist"
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Catskill Mountain Bluestone
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The Catskills: A Geological Guide Expanded Edition
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The Catskills in the Ice Age : Third Edition, Revised and Expanded
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The Catskills in the Ice Age
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The Catskills: A Geological Guide
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Colored Cold
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