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Opalina : its anatomy and reproduction, with a decription of infection experiments and a chronological review of the literature / by Maynard M. Metcalf.

An outline of the theory of organic evolution : with a description of some of the phenomena which it explains / by Maynard M. Metcalf.

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Metcalf, Maynard M. (Maynard Mayo), 1868-1940

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Opalina : its anatomy and reproduction, with a decription of infection experiments and a chronological review of the literature / by Maynard M. Metcalf.

An outline of the theory of organic evolution : with a description of some of the phenomena which it explains / by Maynard M. Metcalf.