correction-of-error-and-the-psychic-development-of-the-child-san-francisco-panama-pacific-international-exposition-lecture-18-14-september-1915-apbxvtl6 Post date December 14, 2021 Tags Maria Montessori - Speeches, addresses, etc., Panama-Pacific International Exposition (1915, San Francisco, California) ← developmental-learning-and-sensorial-objects-san-francisco-panama-pacific-international-exposition-lecture-14-6-september-1915-i7irhdcd → characteristics-of-montessori-materials-los-angeles-lecture-2-12-may-1915-wgui5ahr