O ddifri
By: Dafydd Wigley.
Edition: Arg. 1.
Series: Cyfres y cewri ;; 10
Publisher: Gwasg Gwynedd
Published: 1992
Place of publication: Caernarfon
Language: wel
Number of pages: 359
Subjects: Wigley, Dafydd.; Plaid Cymru -- Biography.; Legislators -- Great Britain -- Biography.; Nationalists -- Wales -- Biography.; Wales -- Politics and government -- 20th century.
Notes: "Cyfrol 1"
Continued by Dal ati, v. 2 (1993) and Maen i'r wal, v. 3 (2001) in the author's untitled autobiography.