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Efektivnost na selskostopanskoto proizvodstvo pri polivni uslovija
Petrov, E.; Lozanova, C.; Ikonomov, B. - 1980
Persistent link: https://www.econbiz.de/10003117358
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Elektroenergetikata v Bălgarija
Nabatov, Nikita (contributor) - 2015
Persistent link: https://www.econbiz.de/10011400333