National Research Council (U.S.). Transportation Research Board. (1997). Pavement base and foundation materials, deformation characteristics of subgrade, and properties of unconventional aggregates. National Academy Press.
Dyfyniad Arddull ChicagoNational Research Council (U.S.). Transportation Research Board. Pavement Base and Foundation Materials, Deformation Characteristics of Subgrade, and Properties of Unconventional Aggregates. Washington, D.C.: National Academy Press, 1997.
Dyfyniad MLANational Research Council (U.S.). Transportation Research Board. Pavement Base and Foundation Materials, Deformation Characteristics of Subgrade, and Properties of Unconventional Aggregates. National Academy Press, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.