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Fund for the Advancement of Education(10)
Max-Planck-Institut für Physik (1946-1958)(9)
Conference on the Clarification of Educational Philosophy (2 : 1953 : London) (1953-1953)(4)
Conference on the Clarification of Educational Philosophy (3 : 1953 : New York) (1953-1953)(3)
Conference on the Clarification of Educational Philosophy (1 : 1953 : Princeton, NJ) (1953-)(2)