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Photo 9 - Water clarity test

This image above shows Dr. Matthew C. Perry and Edward J.R. Lohnes testing the water clarity using a secci disc on the Restigouche River, New Brunswick, Canada.

This image above shows Dr. Matthew C. Perry and Edward J.R. Lohnes testing the water clarity using a secci disc on the Restigouche River, New Brunswick, Canada.
Photo Credit: Dr. Glenn Olsen, USGS - Patuxent Wildlife Research Center 2003
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