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Dyfyniad Arddull ChicagoOrganisation for Economic Co-operation and Development. Construction of Roads on Compressible Soils: A Report Prepared by an OECD Road Research Group, December 1979. Paris: Organisation for Economic Co-operation and Development, 1980.
Dyfyniad MLAOrganisation for Economic Co-operation and Development. Construction of Roads on Compressible Soils: A Report Prepared by an OECD Road Research Group, December 1979. Organisation for Economic Co-operation and Development, 1980.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.