Thanks for the lead to Davies - Welsh Bios
"Despite his undisputed abilities and his promising early work, his contribution to Welsh scholarship proved to be erratic and uneven. However, his songs for children in Cerddi Huw Puw (1923), Cerddi Robin Goch (1935) and Cerddi Portinllaen (1936), many of which are based on sailors' songs he had heard during his youth, bear the marks of a genius. His posthumous book of poems, Cerddi Edern a cherddi ereill (1955), contains many lyrics which will undoubtedly live. One could add that his reminiscences of the Welsh society he knew early in life, and his comments on it, are always interesting and very penetrating."
Hoping I can get some of his works. We'll be staying near Portinllaen in the Fall, and there is a great Welsh bookstore in Pwllheli!
Chris