Coal industry on January 1, 1933, 1934. From the atlas "Industry of the USSR at the beginning of the 2nd Five-Year Plan. Geographical atlas." Conventional signs: boundaries (5 types), settlements (5 groups), railways (operating, under construction); mines and pits (8 types), mining operations (6 types), deposits (4 types), areas of distribution (5 types); numbers indicate the serial numbers of mining administrations, mines or mines in the list (Appendix: List of industrial enterprises to the Atlas. M., 1934).