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0307_013.jpg
Piaget preoperational child girl age 4...
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0307_268.jpg
Piaget Preoperational child conservation of...
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4504_1.jpg
Young woman interning in conservation exhibits...
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0307_363.jpg
Piaget Preoperational child conservation of liquid
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2302_7.jpg
Piaget conservation of liquid preoperational...
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2302_3.jpg
Piaget conservation of liquid preoperational...
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2302_19.jpg
Piaget conservation of liquid preoperational...
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4504_8.jpg
Young woman interning in conservation exhibits...
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4219_073.jpg
6 year old boy in kitchen with his mother...
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0307_519.jpg
Piaget Preoperational child conservation of...
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0307_515.jpg
Piaget Preoperational child conservation of...
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0307_434.jpg
Piaget Preoperational child conservation of...
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0307_009.jpg
Piaget preoperational child girl age 4...
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0307_543.jpg
Piaget Preoperational child conservation of number
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0307_452.jpg
Piaget Preoperational child conservation of liquid
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0307_378.jpg
Piaget Preoperational child conservation of...
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0307_558.jpg
Piaget Preoperational child conservation of liquid
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0307_500.jpg
Piaget Preoperational child conservation of liquid
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0307_475.jpg
Piaget Preoperational child conservation of area
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0307_384.jpg
Piaget Preoperational child conservation of...
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0307_363.jpg
Piaget Preoperational child conservation of liquid
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0307_342.jpg
Piaget Preoperational child conservation of liquid
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0307_303.jpg
Piaget concrete operations conservation of number
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0307_298.jpg
Piaget concrete operations conservation of number
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0307_230.jpg
Piaget Preoperational child conservation of...
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0307_224.jpg
Piaget Preoperational child conservation of...
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4504_7.jpg
Young woman interning in conservation exhibits...
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4504_6.jpg
Young woman interning in conservation exhibits...