Grigorova E., Christoskov L., Sokerova D., Rizhikova S., Roglinov A., 1978. Catalogue of earthquakes in Bulgaria and the nearby territories during the period 1st cent. BC - 1977. Geophysical Institute, Bulgarian Academy of Sciences, Sofia (unpublished).
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Nell'archivio ci sono In the archive there are 43 terremoti provenienti da questo studio: earthquakes considered from this study:
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