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Ezra Blaustein
![Historical Agency](https://jewishreviewofbooks.com/wp-content/uploads/2018/12/Blaustein-1024x576-c-default.jpg)
Historical Agency
Among the many papers discovered in the Cairo Geniza are documents, including letters between Yeshua ben Ismail of Alexandria and Khalluf ben Musa in Qayrawan, in present-day Tunisia. The papers showing disintegration of their partnership shine a light on how a particular kind of business agreement affected the composition of a halakhic guidebook still widely consulted to this day.