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Results include
  1. Experimental studies on the nature of species

    Clausen, Jens Christian, 1891-
    Washington, D.C., 1940-

    Online Full text via HathiTrust

  2. Meiosis in two species and three hybrids of Crepis and its bearing on taxonomic relationship

    Babcock, E. B. (Ernest Brown), 1877-1954
    Berkeley, University of California press, 1929.

    Online Full text via HathiTrust

  3. Stages in the evolution of plant species

    Clausen, Jens (Jens Christian), 1891-1969
    New York : Hafner Pub. Co., 1962.

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