The joint roughness coefficient (JRC). introduced in Barton (1973) represented a new method in rock mechanics and rock engineering to deal with problems related to joint roughness and shear strength estimation. It has the advantages of its simple form. easy estimation. https://www.spidertattooz.com/BON-VIV-Spiked-Seltzer-Grapefruit-6pk-12oz-Can-4-5-ABV/
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