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Document Designation and Title Year Select Item(s) C423 Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method 09 C423 Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method 08a C423 Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method 08 C423 Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method 07a C423 Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method 07 C423 Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method 06 C423 Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method 02ae1 C423 Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method 02a C423 Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method 02 C423 Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method 01 C423 Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method 00 C423 Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method 99a