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3. Ar gyfer dangosyddion sŵn rheilffyrdd rhaid defnyddio'r dull asesu “Calculation of railway noise” (Yr Adran Drafnidiaeth, 13 Gorffennaf 1995, Y Llyfrfa)(1) wedi'i addasu fel a welir yn Ffigur 6.5 yn yr adroddiad “Rail and wheel roughness – implications for noise mapping based on the Calculation of Railway Noise procedure” (DEFRA, Mawrth 2004)(2).
ISBN 0115517545.
Paratowyd gan AEA Technology plc, Cyfeirnod y Ddogfen: AEATR-PC&E-2003-002.
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