measuring-physical-progress-aids-us-in-the-childs-psychic-development-san-francisco-panama-pacific-international-exposition-lecture-9-21-august-1915-cu55x2s6 Post date December 14, 2021 Tags Maria Montessori - Speeches, addresses, etc., Panama-Pacific International Exposition (1915, San Francisco, California) ← montessoris-teaching-of-arithmetic-san-francisco-panama-pacific-international-exposition-lecture-3-4-9-august-1915-gsyd3ugf → isolation-of-difficulty-and-the-psychic-development-of-the-child-san-francisco-panama-pacific-international-exposition-lecture-15-8-september-1915-w8k4mavx