Mills were producing coarse paper by the 1840s.
Source: Shorter A H,'Paper making in the British Isles', David & Charles, 1971, p189.
B.A.Malaws, RCAHMW, 13 April 1999.
Paper-Mills and Paper-Makers in Wales 1700-1900, Alun Eirug Davies, National Library of Wales Journal, Vol XV/1, Summer 1967.