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Talc --- Talc industry
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Land use --- Phytogeography --- Environmental aspects --- History.
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Hydraulic measurements. --- Hydraulics --- Pressure gages. --- Instruments.
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A website devoted to the historical collections of the USGS.
Geological Survey (U.S.) --- History --- Computer network resources. --- Museums.
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Marine eutrophication --- Nutrient pollution of water --- Water --- Nitrogen content --- National Wetlands Research Center (U.S.)
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