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Bjørkepollen, birch pollen | by NTNU, Faculty of Natural Sciences

Bjørkepollen, birch pollen | by NTNU, Faculty of Natural Sciences

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NTNU, Faculty of Natural Sciences By: NTNU, Faculty of Natural Sciences

Bjørkepollen, birch pollen

Foto: Per Harald Olsen/NTNU

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Taken on April 25, 2014

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