landscape recultivation surface mining 18 environment protection 11 history 7 lakes 7 mining 7 ecosystems 6 more ... mining engineering 6 water reservoirs 6 water courses 6 water courses regulation 6 deep mining 5 brown coal 5 sludge management 4 dump services 4 drainage 4 discharging hopper 4 geography 3 geological survey 3 parks 3 stream restoration 3 uranium 3 water management 3 soil pollution 3 environment 3 architectural composition 2 architecture 2 architecture and town planning 2 biocenoses 2 biotope 2 less ...