Piaget's theory of intellectual development

Revision	When	Who	Comment

8	December 12, 2021	Gustav-Landauer-Bibliothek Witten	person
7	August 12, 2011	ImportBot	add ia_box_id to scanned books
6	September 3, 2010	ImportBot	Added new cover
5	August 19, 2010	IdentifierBot	added LibraryThing ID
4	May 5, 2010	ImportBot	add scanned books from the Internet Archive
3	April 16, 2010	bgimpertBot	Added goodreads ID.
2	December 15, 2009	WorkBot	link works
1	May 29, 2009	ImportBot	Imported from Internet Archive item record.