Managing Change in World Heritage Sites in Wales supplements the relevant sections of Planning Policy Wales and Technical Advice Note 24: The Historic Environment.
Mae Rheoli Newid ar Safleoedd Treftadaeth y Byd yng Nghymru yn ategu adrannau perthnasol Polisi Cynllunio Cymru a Nodyn Cyngor Technegol 24: Yr Amgylchedd Hanesyddol.