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Document Designation and Title Year Select Item(s) D5263 Standard Test Method for Determining the Relative Degree of Oxidation in Bituminous Coal by Alkali Extraction 93(2008) D5263 Standard Test Method for Determining the Relative Degree of Oxidation in Bituminous Coal by Alkali Extraction 93(2001) D5263 Standard Test Method for Determining the Relative Degree of Oxidation in Bituminous Coal by Alkali Extraction 93e1