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Service employee Mary Henson and Hanna Mello (USGS - LaCrosse), at Hog Island Creek, filling trays with silty sediment to be used in a study to determine the amount of lampricide in sediment and water
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Författare:
USFWS Midwest Region
Attributionslänk:
USFWS Midwest Region on Flickr.com
Licens:
Public Domain. Gratis för personligt och kommersiellt bruk. Ingen attribution krävs.
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