Peter Clark has kindly provided me with what I need.
Thanks to him and anybody else who was looking.
Huw
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Huw Thomas, FRGS, FBCartS
Pennaeth Uned Defnyddiau Di-destun Head of Non-Text Materials Unit
a Llyfrgellydd Mapiau and Map Librarian
Llyfrgell Genedlaethol Cymru National Library of Wales
[log in to unmask] Ffôn / Phone 01970 632990
Un o lyfrgelloedd mawr y byd One of the great libraries of the world
http://www.llgc.org.uk/
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