Szukana fraza: [Abstract = The presence of excessively acid deposits on the surface of waste heaps is a characteristic problem, difficult to solve in the reclamation of the post\-mining areas of brown coal mining. These deposits are some of the most difficult to reclaim \[Skawina and Trafas 1971, Krzaklewski 1988\]. The present paper describes an experiment set up on the toxically acid surface deposits of the outer waste heap of \"Bełchatów\" brown coal mine in spring 1995.]

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