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Document Designation and Title Year Select Item(s) C604 Standard Test Method for True Specific Gravity of Refractory Materials by Gas-Comparison Pycnometer 02(2007)e1 C604 Standard Test Method for True Specific Gravity of Refractory Materials by Gas-Comparison Pycnometer 02(2007) C604 Standard Test Method for True Specific Gravity of Refractory Materials by Gas-Comparison Pycnometer 02 C604 Standard Test Method for True Specific Gravity of Refractory Materials by Gas-Comparison Pycnometer 98