1. Anon (1979) Classification of rocks and soils for engineering geological mapping part I: rock and soil materials. Bull Int Assoc Eng Geol 19:364–371.
https://doi.org/10.1007/BF02600503
2. ASTM C616/C616M (2015) Standard specification for quartz-based dimension stone. American Standards for Testing Materials. ASTM International, 2p
3. ASTM D5550-06 (2006) Standard test method for specific gravity of soil solids by gas pycnometer. ASTM International, p 5p
4. ASTM D5731-16 (2016) Standard test method for determination of the point load strength index of rock and application to rock strength classifications. ASTM International, p 11p
5. ASTM D5873-14 (2014) Standard test method for determination of rock hardness by rebound hammer method. ASTM International, 6p