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  1. 1
    The effect of detergent phosphate levels on the cleaning process /
    by Goulden, P. D.
    Published 1972
    Book
  2. 2
    The effects of household sanitary systems on effluent phosphate levels /
    Book
  3. 3
    Removal of phosphates and metals from sewage sludge /
    by Scott, Dana S.
    Published 1973
    Book
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