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Geosynthetic design & construction guidelines : reference manual. Authors: R. D. Holtz, Barry R. Christopher, Ryan R. Berg, National Highway InstituteThis manual provides information on the design and construction of Geosynthetic Reinforced. Soil (GRS) abutments and the Geosynthetic Reinforced Christopher and R.R. Berg. This manual is an updated version of the FHWA Reference Manual for the National Highway Institutes training courses on geosynthetic