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| Photograph of Gene Likens , American limnologist and ecologist, in the laboratory at Hubbard Brook Experimental Forest .| Science History Institute , photograph by Mariel Carr.| Mariel Carr, Videographer| [{Image src='https://www.austria-forum.org/cc/images/slim/by-sa.png' alt='CC BY-SA 3.0' align='center' link='https://www.austria-forum.org/cc/by-sa-30.html' target='_blank'}]| Datei:Gene Likens in Lab 2015 Mariel Carr.JPG
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