mines bane 3 [vynechat] dejiny baníctva 2 [vynechat] history of mining 2 [vynechat] air pollution 1 [vynechat] air quality management 1 [vynechat] biomonitoring 1 [vynechat] caves 1 [vynechat] damage to environment 1 [vynechat] deposits of raw materials 1 [vynechat] doly 1 [vynechat] drahé kamene 1 [vynechat] environmental quality 1 [vynechat] fortification 1 [vynechat] geological conditions 1 [vynechat] geologické pomery 1 [vynechat] jaskyne 1 [vynechat] kvalita životného prostredia 1 [vynechat] ložiská nerastných surovin 1 [vynechat] ochrana ovzdušia 1 [vynechat] opals 1 [vynechat] opevnenia 1 [vynechat] opály 1 [vynechat] poškodenie životného prostredia 1 [vynechat] precious stones 1 [vynechat] speleology 1 [vynechat] speleológia 1 [vynechat] znečistenie ovzdušia 1 [vynechat]