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Dyfyniad Arddull ChicagoNational Research Council (U.S.). Transportation Research Board and National Research Council (U.S.). Transportation Research Board. Meeting. Design of Structures 2002. Washington, D.C: Transportation Research Board, 2002.
Dyfyniad MLANational Research Council (U.S.). Transportation Research Board and National Research Council (U.S.). Transportation Research Board. Meeting. Design of Structures 2002. Transportation Research Board, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.