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~language:"bul"
~subject:"Gewässerbelastung"
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Bilateral Bulgarian Romanian Conference Scientific Problems of the Danube <1983, Varna; Tulcea>
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Sbornik materiali ot Dvustrannata Bălgaro-Rumănska Konferencija "Naučni Problemi na Reka Dunav" : 4 - 7 noemvri 1983, Varna ; 7 - 10 noemvri 1983, Tulča
Zachariev, Ivan
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Bilateral Bulgarian Romanian Conference Scientific …
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1985
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