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Americas, International Montessori Training Course (3rd, San Diego and San Francisco, USA, 1 July - 30 November 1915), Maria Montessori - Biographic sources, Maria Montessori - Speeches, addresses, etc., Maria Montessori - Writings, Montessori Congress (Oakland, California, 1915), Montessori method of education, North America, Panama-California Exposition (1915, San Diego, California), Panama-Pacific International Exposition (1915, San Francisco, California), United States of America