rieky rivers 5 [vynechat] vodné toky 4 [vynechat] kvalita vody 3 [vynechat] kvalita životného prostredia 3 [vynechat] Environmental quality 2 [vynechat] Rivers 2 [vynechat] Water analysis 2 [vynechat] Water quality 2 [vynechat] Water streams 2 [vynechat] analýza vody 2 [vynechat] old prints 2 [vynechat] staré tlače 2 [vynechat] technické normy a štandardy 2 [vynechat] vlastiveda 2 [vynechat] water streams 2 [vynechat] Slovensko 1 [vynechat] dejiny vodného hospodárstva 1 [vynechat] environmentálne aspekty 1 [vynechat] fauna 1 [vynechat] flóra 1 [vynechat] freight water transport 1 [vynechat] history of water management 1 [vynechat] homeland studies 1 [vynechat] hydraulic structures 1 [vynechat] hydrológia 1 [vynechat] malé vodné toky 1 [vynechat] nádrže vodné 1 [vynechat] nákladná vodná doprava 1 [vynechat] ochrana vôd 1 [vynechat]