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Document Designation and Title Year Select Item(s) G138 Standard Test Method for Calibration of a Spectroradiometer Using a Standard Source of Irradiance 06 G138 Standard Test Method for Calibration of a Spectroradiometer Using a Standard Source of Irradiance 03 G138 Standard Test Method for Calibration of a Spectroradiometer Using a Standard Source of Irradiance 96