What has the author Meurig Thomas written?

Richard Meurig Evans has written:

'Plant yn y diwydiant haearn, 1840-42' -- subject(s): Children, Employment, Iron and steel workers

'Children in the iron industry, 1840-42' -- subject(s): Child labor, History, Iron industry and trade

'Children in the mines, 1840-42' -- subject(s): Child labor, Children, Coal miners, Coal-miners, Employment, History, Personal narratives