Short description: In Russian. Rosenberg, Lazar Davidovich. Sound Focusing Systems. Moscow: Publishing House and Second Type. Publishing House of Akad. Sciences of the USSR in Moscow; Leningrad, 1949. The image is provided for reference only. It may reflect condition of one of the available copies or only help in identifying the edition. Please feel free to contact us for a detailed description of the copies available. SKU6005712