"The complete brochure from the 1962 Seattle Gymanfa Ganu, held at the World's Fair,.Seattle WA. Page 16 of his program has the signatures of all sitting Welsh Members of the British Parliament at that time, notably James Callahan (later to be Prime Minister), George Thomas (later to be speaker of the House of Commons), Cledwyn Hughes (minister for Wales) This is file number PSW00219 in the Welsh Heritage Center archive (see link) Articles describing event of unknown origin"