Disgrifiad
Sea Lock No.52, Glamorganshire Canal, Cardiff: 7 sheets - Plottings, plan and survey of sea lock, by B. A.Malaws, D.K.Leighton and O.T.Morgan, between 1977/78. Marked site 1.
Cychwynnwr
David K. Leighton, Mr Brian A. Malaws, O. Tudor Morgan, RCAHMW