. Lot of bibliographic works: Jewish Publications in the USSR, Flagship Hebrew Publishers
1. Flagship Hebrew Publishers “from the first Hebrew printing until the end of the 19th century”, by Avraham Ya’ari. Jerusalem 1944.
2. Jewish Publications in the USSR, 1917-1960. “Bibliographic lists collected and organized by Y. Y. Cohen, with the assistance of M. Feikazh, ” by H. Shamrock Jerusalem 1961.