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Dyfyniad Arddull ChicagoNATIONAL, Research Council. Highway Capacity Manual (special Report 209). Transportation Research Board, 1985.
Dyfyniad MLANATIONAL, Research Council. Highway Capacity Manual (special Report 209). Transportation Research Board, 1985.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.