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3. People's Commissariat of Labor of the USSR and the People's Commissariat of Railways of the USSR of
4. April 2, 1931 No. NKT-85 on the procedure for measures for improving working conditions in railway
5. transport]. Izvestiya Narodnogo komissariata truda SSSR. 1931. No. 16-17. pp. 303-311. 2. Izvlechenie iz