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Document Designation and Title Year Select Item(s) E1121 Standard Practice for Measuring Payback for Investments in Buildings and Building Systems 07e1 E1121 Standard Practice for Measuring Payback for Investments in Buildings and Building Systems 07 E1121 Standard Practice for Measuring Payback for Investments in Buildings and Building Systems 02 E1121 Standard Practice for Measuring Payback for Investments in Buildings and Building Systems 98