Ma'aseh Toviyyah or Ma'aseh Tobiyyah ("Work of Tobias") was an encyclopedic scientific reference book written by Tobias Cohn. It was published in Venice, Italy, in 1707, and reprinted there in 1715, 1728, 1769, and 1850. In part 2 are found an astrolabe and illustrations of astronomical and mathematical instruments. Inserted between parts 6 and 7 is Turkish-Latin-Spanish dictionary; and prefixed to the work is a poem by .
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