Dissertations, Academic (Ph.D) 79 History 58 Economics 52 Tourism 51 Environmental impact analysis 50 Climatic changes 44 Environmental impact 43 Social aspects 42 Globalization 40 India 40 Mass media 40 Women 33 Economic development 32 Research 31 Agriculture 30 Philosophy 30 Management 29 Social Sciences 29 Education 28 Social conditions 28 Pollution 25 Ecology 23 Law and legislation 23 Human rights 22 Tourism and Travel 22 Climate change 21 Economic aspects 21 Agricultural economics 20 Economic impact 20 History and criticism 20