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  1. 1

    Biological control of nitrogen in wastewater treatment by Barnes, David , 1945-, Bliss, P. J. [ (Peter John)]

    Published 1983
  2. 2

    Biological wastewater treatment by Grady, C. P. Leslie , 1938-

    Published 2011
  3. 3
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    Wetlands for Water Pollution Control by Scholz,Miklas