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|Material Type:||Fiction, Juvenile audience|
|All Authors / Contributors:||
Etienne Delessert; Jean Piaget
|Notes:||On spine: How.|
|Description:|| p. col. illus., ports. 29 cm.|
|Responsibility:||Text and pictures by Étienne Delessert. Foreword by Jean Piaget. In collaboration with Odile Mosimann for the text and experimentation. Director of experimentation: Jean Piaget ...|