Moscow city. XXVI Congress of the CPSU. Leonid Brezhnev is speaking. Leonid I. Brezhnev awards the international crew of the Soyuz-39 spacecraft to V. Dzhanibekov, J. Gurrach. The city of Leningrad. Streets, monuments. Erdenet city. Production processes at a Mongolian-Soviet enterprise - a copper-molybdenum plant. The city of Darkhan. Streets. Darkhan CHP. Ulan Bator city. Streets. Combines "Niva", Soviet tractors in the fields. Russian language lesson at school. Sale of Soviet books. Manufacturing processes in enterprises. Soviet and Mongolian specialists at work.