Description Izvestiya of the People's Commissariat of Labor of the USSR. - Officer. ed. -Moscow: B. and., 1932. - . Source of the electronic copy: PB 1924 No. 32. August 30: Year 3. - [International (39) type. MNHH "Mospoligraf"], 1924. -16 p. : tab. - Bibliograf. in a substring. note . -30000 copies. . Source of the electronic copy: PB Publisher [Интернациональная (39) тип. МСНХ "Мосполиграф"]