
The BIRS Index is a share index of the 12 largest companies listed on the Banja Luka Stock Exchange (BLSE), established on 1 May 2004. BIRS stands for Berzanski indeks Republike Srpske, which is Serbian for The Stock Exchange Index of Republika Srpska, an entity in Bosnia and Herzegovina. The constituents of the index are determined semi-annually,...
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http://en.wikipedia.org/wiki/BIRS

Image:Birs laufen.jpg|thumb|The Birs in LaufenThe Birs (French: Birse) is a 73-km long river in Switzerland that flows through the Jura region and ends as a tributary to the Rhine between Basel and Birsfelden. It is the most important river of the Swiss Jura. ==Course== The Birs has its source in a spring near the Col de Pierre Pertuis at 762 m al...
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http://en.wikipedia.org/wiki/Birs

(from the article `Jura Mountains`) ...Joux has an underground outlet reappearing as a river, the Orbe, about 2 miles (3 km) farther down. Similar underground stream sources are ...
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http://www.britannica.com/eb/a-z/b/69
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