Oil 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); oil refining (4 types), fuel oil processing (12 types), oil pipelines (4 types), existing fields, exploration and exploration areas (5 types), gas shows, oil fields; numbers indicate the numbers of industrial enterprises in the list (Appendix: List of industrial enterprises to the Atlas. M., 1934).