Dynion wrth eu gwaith
By: David Smith a Derek Newton ; cyfieithwyd gan E. Ellis Jones ; darluniau gan Bernard Blatch.
Contributors: Newton, Derek.; Blatch, Bernard.
Series: Rhyfeddodau'r byd
Publisher: Blackie
Published: 1973
Place of publication: London
Language: wel
Number of pages: 16
Work titles: Men at work.