Cover title.
URN 10D/948.
"Hydref 2010."
Rheoliadau Cyfiawnhau Arferion sy'n Ymwneud ag Ymbelydredd Ïoneiddio 2004 : Y rhesymau dros Benderfyniad yr Ysgrifennydd Gwladol fel Awdurdod Cyfiawnhau ar y Cyfiawnhad Rheoleiddiol dros y Dosbarth ne. Published by Department of Energy and Climate Change in 2010. Publication and catalogue information, links to buy online and reader comments.