Darshan Singh Sarai (Sarai, Darshan Singh)

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  Basic Chemistry for Water & Wastewater Operators
  by Darshan Singh Sarai
  Softcover, Amer Water Works Assn, ISBN 1583211489 (1-58321-148-9)
• 
  Water Treatment Made Simple: For Operators
  by Darshan Singh Sarai
  Softcover, John Wiley & Sons Inc, ISBN 0471740020 (0-471-74002-0)