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Computer science 1 - made easy. Workbook for grades 8/9. Informatik 1 - leicht gemacht. Arbeitsheft fuer die Klassen 8/9. (German)
Frankfurt am Main: Diesterweg; Sauerlaender. 1989. 80 p. [ISBN 3-425-05235-7]; ISBN 3-7941-2968-7
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