Traddodwyd y darlith hon yn Senedd-dy Owain Glyndŵr, Machynlleth, 16 Medi 1994 = This lecture was delivered at Senedd-dy Owain Glyndŵr, machynlleth, 16 September 1994.
Teitl clawr = Cover title.
Gwylliaid Cochion Mawddwy by J. Gwynfor Jones. Published by Cymdeithas Addysg y Gweithwyr, Rhanbarth Gogledd Cymru in 1997. Publication and catalogue information, links to buy online and reader comments.