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- Language: English
- Year: 1959

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- Language: English
- Year: 1993

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- Author: Ministry Ministry of Foreign Affairs Democratic People's Republic of Korea
- Language: Русский
- Year: 1960

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- Author: Ministry of Foreign Affairs Democratic People's Republic of Korea
- Language: English
- Year: 1960

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- Author: Robert Wipper
- Language: English
- Year: 1947

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- Year: 1959

- Author: Abram Ioffe
- Language: English
- Year: 1957