There are specialists on printing in Wales. E.Wyn James at University of Wales Cardiff is one; I think his particular interests re: printing are in ballad sheets and hymn books but he has a sound knowledge of the rest. He once told me of going to an international ballad symposium and a word expert - English - expressed his surprise that working class balladeers who wrote and printed their own material seemed to be found across the UK but next to none in Wales. The twit had only been looking at English language sources. 'Expert' my foot. He was researching a time when large swathes of Wales were 80% Welsh speaking (some higher than that) and it hadn't occurred to him that this might be a factor.

Of course, the most famous hand-written source is the Robert ap Huw manuscript.

sian