Ze'ev Safrai
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Since the Mishnah is a code of law, its textual style is very concise and lacking in socio-historical background. While some scholarly attempts have been made to understand the meaning of the Mishnah and some attempts have been made to sketch the biographies of the authorities the Mishnah mentions (by referring to talmudic and midrashic sources, for example) Mishnat Eretz Yisrael is the only complete commentary to the Mishnah that uses socio-historical evidence of the time to provide context for the Mishnah's laws.
Of the expected 45 volumes, 22 have been completed. Provided by Wikipedia