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Contributions à la didactique de la langue maternelle Schneuwly, Bernard; Bronckart, Jean-Paul; Kilcher, Helga; De Weck, Geneviève; ... Pasquier, Auguste 1982
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The Sections of a Parallelepiped and a Cube Piaget, Jean; Kilcher, Helga; Bronckart, Jean-Paul 1992