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Maynard M. Metcalf

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The Eyes and Subneural Gland of Salpa; An Abstract of a Dissertation
Further Studies on the Opalinid Ciliate Infusorians and Their Hosts (Classic Reprint)
Further Studies on the Opalinid Ciliate Infusorians and Their Hosts (Classic Reprint)
An Outline of the Theory of Organic Evolution With a Description of Some of the Phenomena Which It Explains (Classic Reprint)
An Outline of the Theory of Organic Evolution With a Description of Some of the Phenomena Which It Explains (Classic Reprint)