A publication of the International Council for Philosophy and Humanistic Studies. Issues 153-<168> of the English language ed. are sponsored by the American Council of Learned Societies.
No. 1-16, 1953-1956, in no. 16; no. 17-24, 1957-1958, in no. 24; no. 25-32, 1959-1960, in no. 32; no. 1-40, 1953-1962, in no. 40.
Original edition published in French; English, Spanish, German, Italian and Arabic translations published simultaneously by various publishers.