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3. ASTM D4015 (2021) Standard Test Methods for Modulus and Damping of Soils by Fixed-Base Resonant Column Devices, ASTM International, West Conshohocken, PA, www.astm.org
4. ASTM D3740-19 (2019) Standard Practice for Minimum Requirements for Agencies Engaged in Testing and/or Inspection of Soil and Rock as Used in Engineering Design and Construction, ASTM International, West Conshohocken, PA, www.astm.org
5. ASTM D8295-19 (2019) Standard Test Method for Determination of Shear Wave Velocity and Initial Shear Modulus in Soil Specimens using Bender Elements, ASTM International, West Conshohocken, PA, www.astm.org