Letters to John Cartwright, Sir Nicholas Bayly's agent, at Plas Newydd and Newcastle, co. Stafford, mainly relating to building operations at Plas Newydd Letters to John Cartwright, Sir Nicholas Bayly's agent, at Plas Newydd and Newcastle, co. Stafford, mainly relating to building operations at Plas Newydd. They also contain a few references to the sinking of coal pits [? at Penrhyn Mawr, Llanfihangel Ysgeifiog] 1751-1757