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Document Designation and Title Year Select Item(s) C505M Standard Specification for Nonreinforced Concrete Irrigation Pipe With Rubber Gasket Joints [Metric] 05a C505M Standard Specification for Nonreinforced Concrete Irrigation Pipe With Rubber Gasket Joints [Metric] 05 C505M Standard Specification for Nonreinforced Concrete Irrigation Pipe With Rubber Gasket Joints [Metric] 04 C505M Standard Specification for Nonreinforced Concrete Irrigation Pipe With Rubber Gasket Joints [Metric] 03 C505M Standard Specification for Nonreinforced Concrete Irrigation Pipe With Rubber Gasket Joints [Metric] 99a