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.
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