Gerau
By: Chris Ollerenshaw a Pat Triggs ; ffotograffau gan Peter J. Millard.
Contributors: Triggs, Pat.; Millard, Peter, 1960-; Jones, Berwyn Prys.
Series: Teganau technoleg
Publisher: Ivan Corbett
Published: 1994
Place of publication: Penryn
Language: wel
Number of pages: 32
Work titles: Gears.
Notes: Arg. Saesneg gwreiddiol = Original English ed: London : A & C Black, 1991.

Addasiad Cymraeg = Welsh adaptation: Berwyn Prys Jones.

Addasiad Cymraeg o = Welsh adaptation of: Gears.