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Document Designation and Title Year Select Item(s) E1331 Standard Test Method for Reflectance Factor and Color by Spectrophotometry Using Hemispherical Geometry 04 E1331 Standard Test Method for Reflectance Factor and Color by Spectrophotometry Using Hemispherical Geometry 96(2003) E1331 Standard Test Method for Reflectance Factor and Color by Spectrophotometry Using Hemispherical Geometry 96