Y Gwyddoniadur Cymreig, Yr Atodiad
Subtitle: Encyclopaedia Cambrensis
By: Dan Olygiad Y Parchedig John Parry, D.D., Bala
Publisher: Thomas Gee
Published: 1879
Place of publication: Dinbych
Language: wel
Format: Hardcover
Subjects: General; Geography
First sentence: VALDES, JUAN: duwinydd Yspaenaidd.
Description: A general encyclopaedia in Welsh. This, volume X, contains subjects Valdes to Zerusadai, plus the Supplement. The Supplement includes a world gazetteer.
Notes: The volume is number 10 of 10. 
The editor was John Parry (1812-1874).