Local History Sources Clwyd Powys Archaeological Trust Gatehouse gazetteer of medieval fortifications GENUK (St Harmon genealogy) People’s Collection Wales Rhayader Museum and CARAD Royal Commission, Historical Monuments of Wales Welsh Journals Online Pencambria magazine Historic Wales History of Radnorshire Radnorshire Society Welsh Newspapers Online Inventory of Ancient Monuments -Radnorshire(Google Books, available as a PDF)The Kilvert Society Coflein Abbeycwmhir Heritage Trust