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Document Designation and Title Year Select Item(s) E645 Standard Test Method for Efficacy of Microbicides Used in Cooling Water Systems 07 E645 Standard Test Method for Efficacy of Microbicides Used in Cooling Systems 02a E645 Standard Test Method for Efficacy of Microbicides Used in Cooling Systems 02 E645 Standard Test Method for Efficacy of Microbicides Used in Cooling Systems 97