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The variety of a world: Things, plants, animals and people. Proposal no. 3. Die Vielfalt unserer Welt: Gegenstaende, Pflanzen, Tiere und Menschen. 3. Vorschlag(Un mondo vario: Oggetti, piante, animali e persone. Proposta n. 3). (Italian)
Insegn. Mat. (Aug 1982) v. 5(4) p. 4-39.
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