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Document Designation and Title Year Select Item(s) C478M Standard Specification for Precast Reinforced Concrete Manhole Sections (Metric) 12a C478M Standard Specification for Precast Reinforced Concrete Manhole Sections (Metric) 12 C478M Standard Specification for Precast Reinforced Concrete Manhole Sections (Metric) 11 C478M Standard Specification for Precast Reinforced Concrete Manhole Sections (Metric) 09 C478M Standard Specification for Precast Reinforced Concrete Manhole Sections (Metric) 08e1 C478M Standard Specification for Precast Reinforced Concrete Manhole Sections [Metric] 08 C478M Standard Specification for Precast Reinforced Concrete Manhole Sections [Metric] 07 C478M Standard Specification for Precast Reinforced Concrete Manhole Sections [Metric] 06b C478M Standard Specification for Precast Reinforced Concrete Manhole Sections [Metric] 06a C478M Standard Specification for Precast Reinforced Concrete Manhole Sections [Metric] 06 C478M Standard Specification for Precast Reinforced Concrete Manhole Sections [Metric] 05 C478M Standard Specification for Precast Reinforced Concrete Manhole Sections [Metric] 03a C478M Standard Specification for Precast Reinforced Concrete Manhole Sections [Metric] 03 C478M Standard Specification for Precast Reinforced Concrete Manhole Sections [Metric] 97