Lakes 28 Limnology 16 Lake ecology 11 Lake and pond ecology 9 Water 9 Wetlands 9 Dissertations, Academic (Ph.D) 8 Ecology 8 Rivers 8 Eutrophication 6 History 6 Reservoirs 5 Fish culture in lakes, ponds 4 Freshwater & Marine Ecology 4 Geography 4 Hydrology 4 International relations 4 Paleolimnology 4 Sedimentology 4 Tourism 4 Water chemistry 4 Water-supply 4 Zooplankton 4 Aquatic biology 3 Aquatic ecology-- Fresh water ecology-- Pond ecology-- Limnology 3 Climatic changes 3 Criminal justice, Administration of 3 Ecosystems 3 Hotel management 3 International criminal courts 3