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Ru| Description |
The development of a communication and management system in the border guard of the Russian Empire (1827–1917) / Tovpek A.V.- 2014. -605: PowerNo B..Electronic copy source: SPbSU.Website
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| Description |
The development of a communication and management system in the border guard of the Russian Empire (1827–1917) / Tovpek A.V.- 2014. -605: PowerNo B..Electronic copy source: SPbSU.Website
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