"Rheoli perygl llifogydd = managing flood risk" - Cover.
Cynllun rheoli llifogydd dalgylch Afon Dyfrdwy : adroddiad Cryno Ionawr 2010 = River Dee catchment flood management plan : summary report January 2010 by Environment Agency Wales. Published by Asiantaeth yr Amgylchedd Cymru in 2010. Publication and catalogue information, links to buy online and reader comments.