Ivor Roberts-Jones, y daith i Harlech = Ivor Roberts-Jones, the journey to Harlech / Peter Cannon-Brookes yn siarad â'r artist a'i gyfeillion ; Peter Cannon-Brookes in conversation with the artist and his friends. - Cannon-Brookes, Peter, 1938- (Trefoil [in association with the] National Museum of Wales, 1983)