1. ASTM D2487-17e1. Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System); ASTM International: West Conshohocken, PA, USA, 2017.
2. ASTM D1586 / D1586M-18, Standard Test Method for Standard Penetration Test (SPT) and Split-Barrel Sampling of Soils, ASTM International, West Conshohocken, PA, 2018, www.astm.org
3. ASTM D4318-17e1. Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils; ASTM International: West Conshohocken, PA, USA, 2017.
4. Ataee, O., Moghaddas, N. H., & Lashkaripour, G. R. (2019) Estimating shear wave velocity of soil using standard penetration test (SPT) blow counts in Mashhad city. Journal of Earth System Science, 128(3). doi: 10.1007/s12040-019-1077-x
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