View Historical Standards for D2521:

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Document Designation and Title Year Select Item(s) D2521 Standard Specification for Asphalt Used in Canal, Ditch, and Pond Lining 76(2002)e1 D2521 Standard Specification for Asphalt Used in Canal, Ditch, and Pond Lining 76(2002) D2521 Standard Specification for Asphalt Used in Canal, Ditch, and Pond Lining 76(1997)