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Books about Chelen:
o thisauros tis chelen sallivan by mims amy (2007)
Masova shkola za vuzpitanie i chelen opit: (za rabotata na klubovete na ordenonostsite ...) by Mariia Khabova-Atanasova (1984)
Namaliavane na ruchniia trud - chelen opit i initsiativi: Nauchno informatsionno izdanie (1985)
Wiki information Chelen:
The Chelen Glacier is a 2.5 km long glacier situated in the Urner Alps in the canton of Uri in Switzerland. In 1973 it had an area of 3.15 km².
A chelengk was a military decoration of the Ottoman Empire.