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11
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12
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13
Number in preschool and kindergarten educational implications of Piaget's theory
Gepubliceerd in 1982Boek -
14
Children's conservation ability as related to some variables its implications for mathematical education
Gepubliceerd in 1979Thesis -
15
Conceptual approach in the teaching of social studies in elementary school
Gepubliceerd in 1970Thesis -
16
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17