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Soviet studies in mathematics education. Vol. 3. The development of spatial thinking in schoolchildren. Sowjetische Studien zum Mathematikunterricht. Bd. 3. Die Entwicklung raeumlichen Denkvermoegens bei Schulkindern. (English)
Reston, VA: National Council of Teachers of Mathematics. 1991. 254 p. Translated from Russian: Razvitie prostranstvennogo myshleniya by Pedagogika, Moscow 1980. Ser. Title: Survey of applied Soviet research in school mathematics education. [ISBN 0-87353-298-8]
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