STUDIES ON THE COLLECTIVE SPECIES VIOLA TRICOLOR L. II.
Offprint from Botanisk Tidskrift. 37 Binds. 5 Hefte. 1922. Köbenhavn 1922. Wrappers. Pagina 363-416. Illustrated. Owner´s signature on front cover. Jens Clausen (1891-1969) was a Danish-American botanist, genetics, and ecologist. He is considered a pioneer in the field of ecological and evolutionary genetics of plants. (Wikipedia)
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