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 Society. Public Domain Mark. Source: Wellcome Collection.

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This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)