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- Foreign relations5
- History2
- World War, 1939-19452
- Defenses1
- Economic conditions1
- Economic policy1
- Engels, Friedrich, 1820-18951
- Guerra europea, 1914 19181
- Marx, Karl, 1818-18831
- Moscow Trials, Moscow, Russia, 1936-19371
- Politics and government1
- Russo-Finnish War, 1939-19401
- World politics1