Annual of Konstantin Preslavsky University of shumen. Shumen: "Bishop Konstantin Preslavsky" University Press,.
Annual of Konstantin Preslavsky University of shumen. Shumen: "Bishop Konstantin Preslavsky" University Press,.
Annual of Konstantin Preslavsky University of shumen, Shumen: "Bishop Konstantin Preslavsky" University Press.
Annual of Konstantin Preslavsky University of shumen. Faculty of natural sciences : Earth Sciences. Shumen: "Bishop Konstantin Preslavsky" University Press,.
Annual of Konstantin Preslavsky University of shumen: Faculty of natural sciences : Earth Sciences. Shumen: "Bishop Konstantin Preslavsky" University Press;.
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