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• Sherlin, G. C.; Beausoliel, R. W.; Galowin, L. S.
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  Guide Criteria for Laboratory Evaluation of Backflow Prevention Devices for Protection of Potable Water Supplies. Final Report.
  National Bureau of Standards, Washington, DC
  NBSIR 76-1020
  Environmental Protection Agency, Washington, DC, NBSIR 76-1020
  March 1976