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Start Over Collections Medicine in the Americas, 1610-1920 ✖Remove constraint Collections: Medicine in the Americas, 1610-1920 Subjects Fossils ✖Remove constraint Subjects: Fossils Titles A memoir on the geological position of a fossil tree: discovered in the secondary rocks of the river Des Plaines : read before the American Geological Society ✖Remove constraint Titles: A memoir on the geological position of a fossil tree: discovered in the secondary rocks of the river Des Plaines : read before the American Geological Society

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  • A memoir on the geological position of a fossil tree: discovered in the secondary rocks of the river Des Plaines : read before the American Geological Society1