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Montessori materials are NOT toys, but educational materials. Proper use requires appropriate training.
Montessori materials may contain small, rough, sharp, or other elements that could cause injury or damage if used improperly.
It may therefore only be used by children under the supervision of appropriately trained persons and in an appropriate environment.
Based on Dr. Montessori's lectures during her first course in India in 1939. This book, in two volumes, explores the Montessori approach to the education of children between 3 and 6 years of age.