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- environmental protection (10)
- environmental aspects (5)
- hazardous wastes (4)
- congresses (3)
- mineral industries (3)
- environmental engineering (2)
- handbooks, manuals, etc (2)
- pollution (2)
- abandoned mined lands reclamation (1)
- abbreviations (1)
- abbreviations, german (1)
- acronyms (1)
- capital investments (1)
- carbon dioxide mitigation (1)
- chemical industry (1)
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- climatic changes (1)
- company towns (1)
- conservation of natural resources (1)
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