Traddodwyd y ddarlith yn = Lecture delivered at: Eisteddfod Genedlaethol Cymru, Cwm Rhymni 1990.
Dan y bargod : rhai o enwau ardal Cwm Rhymni by Gwynedd O. Pierce. Published by Prifysgol Cymru in 1990. Publication and catalogue information, links to buy online and reader comments.