S. D. Goitein, A Mediterranean Society: The Jewish Communities of the Arab World as Portrayed in the Documents of the Cairo Geniza. Volume II, The Community (Berkeley: University of California Press, 1971). Pp. 650. $20. - S. D. Goitein, Letters of Medieval Jewish Traders Translated from the Arabic with Introductions and Notes (Princeton: Princeton University Press, 1973). Pp. 367. $12.50.