Central Siberia 1:250,000 [cartographic material].

Issued in quadrangles 10 of latitude by 2-30 of longitude.; Relief indicated variously by contours, form lines, shading, and spot heights.; Coordinated with Series N502, Western Siberia, and Series N504, Eastern Siberia.; Each sheet includes "Glossary" and "Location diagram."; Some sheets have city maps on versos.; Accompanied by index map on 2 sheets 27 x 41-51 cm.; Scale 1:250,000