Helynt y twll yn y wal
By: gan Malorie Blackman ; addasiad Iola Jôns.
Contributors: Jôns, Iola.
Series: Cyfres Cled
Publisher: Honno
Published: 1999
Place of publication: Dinas Powys
Language: wel
Number of pages: 167
Work titles: Operation gadgetman.
Notes: Arg. Saesneg gwreiddiol = Original English ed.: Llundain: Transworld Publishers Ltd, 1993.

Addasiad Cymraeg gan = Welsh adaptation by: Iola Jôns.

Addasiad Cymraeg o = Welsh adaptation of: Operation gadgetman.