Gwyddoniaeth trwy brofiad.
Campbell, Les.
Llandysul : Gomer mewn cydweithrediad â Heinemann Educational Books,
1991.
Arg Saesneg gwreiddiol = Original English ed: London: Inner London Education Authority, 1988
Cyfieithydd = Translator: Elfrys Jones
Rhai manylion teitl o'r clawr = Some title information from cover
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