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2591
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2592
A summary of research in science education for the years 1965-67, elementary school level
Publicado em 1969Livro -
2593
A summary of research in science education for the years 1965-67, secondary level
Publicado em 1969Livro -
2594
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2595
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2596
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2597
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2598
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2599
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2600
New approaches to teaching elementary social studies with illustrative units
Publicado em 1969Livro