<style face="normal" font="default" size="100%">Catalogue of the Earthquakes in the Territory of Bulgaria for the Period 1900-1977</style>

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6

<style face="normal" font="default" size="100%">Catalogue of the Earthquakes in the Territory of Bulgaria for the Period 1900-1977</style>

Drupal-Biblio

6

<style face="normal" font="default" size="100%">New Catalogue of the Earthquakes in the Territory of Bulgaria and Adjacent Region for the Period V century BC to XIX century</style>