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Document Designation and Title Year Select Item(s) C181 Standard Test Method for Workability Index of Fireclay and High-Alumina Plastic Refractories 09 C181 Standard Test Method for Workability Index of Fireclay and High-Alumina Plastic Refractories 03 C181 Standard Test Method for Workability Index of Fireclay and High-Alumina Plastic Refractories 91(1997)e1