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Books about Casnodyn:
Gwaith Casnodyn (Cyfres Beirdd yr Uchelwyr) by Casnodyn (1999)
A Welsh Song In Patagonia [Paperback]  (Author) William, Casnodyn Rhys (2005)
Wiki information Casnodyn:
Casnodyn was a Welsh language poet born in Gilfai, near present-day Swansea, south-west Wales.