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Barbel

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The Psychology of the Child

By Piaget, Jean, Inhelder, Barbel

The 21 Golden Rules for Cosmic Ordering

By Mohr, Barbel

The Growth of Basic Mathematical and Scientific Concepts in Children (Unibooks S.)

By Lovell, Kenneth, Inhelder, Barbel

Mein erster Naturführer - Was lebt im Wald?

By Walentowitz, Steffen, Oftring, Barbel, Köhrsen, Andrea

Psychology of the Child

By Piaget, Jean, Inhelder, Barbel, Weaver, H.

Miracle of Self- Love, The: The Secret Key to Open All Doors

By Mohr, Barbel, Manfred