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bulgaro suvetskata druzhba i bzns 1977 varna
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Velikii͡at oktomvri, bŭlgaro-sŭvetskata druzhba i BZNS
Nauchno-prakticheska konferentsii͡a "Velikii͡at oktomvri, bŭlgaro-sŭvetskata druzhba i BZNS" (1977 Varna, Bulgaria) · Okrŭzhno rŭkovodstvo na BZNS
159 sayfa · 1977
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