Beth yw hwn?
Subtitle: llyfr gair-a-llun i'r plant lleiaf.
Publisher: Gwasg y Dref Wen
Published: 1991
Place of publication: Caerdydd
Language: wel
Subjects: Welsh language -- Readers.
Work titles: What's that?. Welsh.
Notes: Arg Saesneg gwreiddiol = Original English ed: Campbell Books, 1987.

Teitl clawr = Cover title.

Testun ar y cloriau = Text on inside covers.