%0 Journal Article %A %D 2015 %J International Journal of Geography and Geology %@ 2305-7041 %V 4 %N 5 %P 89-95 %T Presentation of Empirical Equations for Estimating Internal Friction Angle of SP and SC Soils in Mashhad, Iran Using Standard Penetration and Direct Shear Tests and Comparison with Previous Equations %M 10.18488/journal.10/2015.4.5/10.5.89.95 %U http://www.pakinsight.com/archive/10/05-2015/5