envelope: 100th anniversary of A. Balevski
seal: 100th anniversary of A. Balevski
envelope: 100 years sugar factories Gorna Oryahovica
seal: 100 years sugar factories Gorna Oryahovica
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Institute of metal science, equipment and technologies acad. A.Balevski with hydroaerodynamics centre - Bulgarian academy of sciences.; Zaharni Z Read More
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