<strong>Berg, R.R., Christopher, B.R., and Samtani, N. (2009).</strong> “Mechanically Stabilized Earth Walls and Reinforced Slopes, Design and Construction Guidelines”, Vol. I - FHWA-NHI-10-024<em>,</em> Vol. II – FHWA-NHI-10-025, Federal Highway Administration, Washington, D,.C.