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Âàëüäåíáóðãñêèå ñëîè

— íèæíèé ÿðóñ âåðõíåãî, èëè ïðîäóêòèâíîãî, îòäåëà êàìåííîóãîëüíîé ñèñòåìû â Ãåðìàíèè.


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