Image: Wilhelm Johannsen 1857-1927
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Description: WWilhelm Johannsen (1857-1927) Danish biologist Sujet : Portrait de Johannsen
Title: Wilhelm Johannsen 1857-1927
Credit: The History of Biology de Erik Nordenskiöld, Ed. Knopf, 1928 (domaine public)
Author: Unknown authorUnknown author
Usage Terms: Copyrighted free use
License: Copyrighted free use
License Link: //commons.wikimedia.org/wiki/File:Wilhelm_Johannsen_1857-1927.jpg
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