davel
Member
An additional dataset that is North Wales specific is http://www.hendrecoed.org.uk/Wilkinson
It’s a lot more specific for the region compared to the GB1900 data but still based on historical maps, so the accuracy varies.
Although Wilkinson's gazetteer and bibliography originally covered just metalliferous mines and the slate quarries of north Wales, it now covers the whole of Wales (including the south Wales coalfield).
Dave