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Volume of a Pyramid
10 puzzles en bois (20 x 14 cm) de 5 x 6 pièces et 5 x 8 pièces
plus 5 paires représentant les altérations musicales que sont les dièses et les bémols
un cocon où la transformation a lieu et un papillon qui s'envole
Maria Montessori Writes To Her Father (anglais) biol-3-6 Volume of a PyramidMaria Montessori traveled to America for the first time in 1913, a hugely successful visit leading to an even greater interest in her educational ideas. In the following year, her American supporters urged her to return to conduct training courses, which were in great demand. To celebrate the formidable technical achievement of constructing the Panama Canal, two simultaneous expositions had been organized: The Panama Pacific International Exposition
