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How are non-verbal instructions and problems acquired. Comparative study of German and foreign primary school pupils. Wie werden nichtverbale Anweisungen und Aufgaben erlernt. Vergleichende Untersuchung bei deutschen und auslaendischen Grundschulkindern. (German)
Sachunterr. Math. Primarst. (Nov 1978) v. 6(11) p. 521-526. [ISSN 0170-0944]
Classification: C52 E42
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