Rivers 56 Dissertations, Academic (Ph.D) 16 River 15 Ecology 10 Hydrology 9 Lakes 9 River, stream ecology 9 Pollution 8 Dams 7 History 7 Human ecology 7 Kerala 7 Water 7 India 6 Voyages and travels 6 Water resources development 6 Geography 5 Irrigation 5 Rivers-India 5 Stream ecology 5 Thesis (Ph.D)-Zoology 5 Watershed management 5 rivers 5 Antiquities 4 Ganga river 4 Himalayan rivers 4 Mountains 4 River basin management 4 River engineering 4 River, stream ecology-India 4