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41
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42
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43
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44
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45
An assessment of the Cuisenaire-Gattegno approach to the teaching of number in the first year at school
Gepubliceerd in 1965Boek -
46
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47
Counting and measuring an approach to number education in the primary school
Gepubliceerd in 1961Boek -
48
The Foundations of arithmetic a logico-mathematical enquiry into the concept of number
Gepubliceerd in 1960Boek -
49
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50


