In 1886, he began publishing his magnum opus, the popular and comprehensive Dictionary of the Targumim, Talmud Bavli, Talmud Yerushlami, and Midrashic Literature, in pamphlet form (1886-1903). It was finally completed and published in two-volume form in 1903, and has since become a popular resource for students of the Talmud.

In the preface