Photograph Association Montessori Internationale Maria and Mario Montessori photographed with Adelia Pyle (translator) and students from the 3rd International Montessori Training Course held in San Fransisco, California. The course was held during the Panama–Pacific International Exposition. A Montessori "glass classroom" was set up as part of the exhibition. Montessori, Maria, 1870-1952 Montessori, Mario, 1898-1982 Panama–Pacific International Exposition

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