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  1. 1
    The use of continuous water-quality time-series data to compute nutrient loadings for selected Iowa streams, 2008-17 /
    by Garrett, Jessica D.
    Published 2019
    Subjects: “...Sewage Purification Nutrient removal Iowa....”
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    Government Document eBook
  2. 2
    Oxidation ditch treatment of meatpacking wastes /
    by Paulson, Wayne L.
    Published 1979
    Subjects: “...Sewage Purification Activated sludge process....”
    Government Document Book
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