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Keywords from Image Description:
MARTIN KARLSEN plankton. THE MARTIN KARLSEN CANADIAN SHIP IS FLOATING LABORATORY FROM WHICH SCIENTISTS ARE ANALYZING PHYSICAL CHEMICAL BIOLOGICAL AND METEOROLOGICAL CONDITIONS IN LAKE SUPERIOR SUCH COMPLETE STUDY OF FRESH WATER IS CALLED LIMNOLOGY LIMNOLOGIST DRAINS CONTENTS OF PLANKTON NET INTO LABORATORY BOTTLE THE MARTINKARLSEN