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Periodicals --- geology --- palaeontology --- botany --- zoology --- Natural history --- History, Natural --- Natural science --- Physiophilosophy --- Biology --- Science --- Natural history. --- Bulgaria. --- Bâlgarija --- Baojialiya --- Baojialiya Gongheguo --- Bolgarii͡ --- Bolgarija --- Bugarska --- Bulgarie --- Bulgarien --- Bŭlgarii͡ --- Bulgario --- Bulgaristan --- Bŭlgariya --- Bulharsko --- Burugaria --- Narodna republika Bŭlgarii͡ --- Narodna Republika Bŭlgariya --- Narodnai͡a Respublika Bolgarii͡ --- NRB --- People's Republic of Bulgaria --- Republic of Bulgaria --- República de Bulgaria --- Republika Bulgaria --- Republika Bŭlgarii͡ --- Republika Bŭlgariya --- République bulgare --- République de Bulgarie --- Respublika Bolgarii͡ --- Volksrepublik Bulgarien --- Voulgaria

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Ethnology --- Congresses. --- -Cultural anthropology --- Ethnography --- Races of man --- Social anthropology --- Anthropology --- Human beings --- Congresses --- Bulgaria --- History --- -Congresses. --- Social life and customs --- Conferences - Meetings --- -Congresses --- Bulgaristan --- Volksrepublik Bulgarien --- Republic of Bulgaria --- Republika Bŭlgariya --- Republika Bŭlgarii︠a︡ --- People's Republic of Bulgaria --- République bulgare --- Narodna Republika Bŭlgariya --- Bŭlgariya --- Narodna republika Bŭlgarii︠a︡ --- Bŭlgarii︠a︡ --- Bugarska --- Bulgarien --- Bulharsko --- Voulgaria --- Burugaria --- NRB --- Narodnai︠a︡ Respublika Bolgarii︠a︡ --- Bulgario --- Republika Bulgaria --- Bulgarie --- Bolgarija --- Bâlgarija --- République de Bulgarie --- República de Bulgaria --- България --- Република България --- Болгария --- Bolgarii︠a︡ --- Республика Болгария --- Respublika Bolgarii︠a︡ --- 保加利亚 --- Baojialiya --- 保加利亚共和国 --- Baojialiya Gongheguo --- Cultural anthropology --- Ethnology - Bulgaria - Congresses. --- Civilisation