Title from PDF file title page (viewed on 3 May, 2011).
URN 10D/532.
Cyfarwyddyd cymdeithasol ac amgylcheddol i'r Awdurdod Marchnadoedd Nwy a Thrydan : Cyflwynwyd i’r Senedd yn unol ag adran 4AB(4) o Ddeddf Nwy 1986 ac adran 3B(4) o Ddeddf Trydan 1989. Published by Department of Energy & Climate Change in 2010. Publication and catalogue information, links to buy online and reader comments.