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Category:Impurities

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A 1973 photo of  technician, Zeljko Kwokal measuring metal impurities in waste water - Photo by Yoichi Robert Okamoto and the National Archives and Records Administrion- Not an original record- #54933.
A 1973 photo of technician, Zeljko Kwokal measuring metal impurities in waste water - Photo by Yoichi Robert Okamoto and the National Archives and Records Administrion- Not an original record- #54933.

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