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Document Designation and Title Year Select Item(s) D1621 Standard Test Method for Compressive Properties Of Rigid Cellular Plastics 04a D1621 Standard Test Method for Compressive Properties Of Rigid Cellular Plastics 04 D1621 Standard Test Method for Compressive Properties Of Rigid Cellular Plastics 00 D1621 Standard Test Method for Compressive Properties of Rigid Cellular Plastics 94