Iolo Morganwg a chywyddau'r ychwanegiad
By: gan G.J. Williams ... gyda rhagymadrodd gan Syr John Morris-Jones ...
Series: Cynyrchion yr eisteddfod genedlaethol o dan olygiaeth E. Vincent Evans
Publisher: Gymdeithas yr eisteddfod genedlaethol
Published: 1926
Place of publication: Llundain
Language: wel
Number of pages: 271
Notes: Disputing the authorship of certain poems generally attributed to Edward Williams.