History 21 Arts 14 Pollution and Degradation 13 Foreign relations 9 Management 9 Politics and government 8 Cost accounting 7 Environmental impact 7 History and criticism 7 Industrial Wastes and Effluents 7 Mathematical models 7 Social conditions 7 Animal Wastes 6 Arts, Entertainment and Cultural Heritage 6 Law and legislation 6 Soil Science and Agricultural Chemistry 6 Tourism and Travel 6 Water Resources 6 Case studies 5 Civilization 5 Dissertations, Academic (Ph.D) 5 Evidence (Law) 5 Field Crops, (New March 2000) 5 International law and human rights 5 LANGUAGE ARTS & DISCIPLINES / Linguistics / General 5 LAW / International 5 Leadership 5 Leisure, Recreation and Tourism Economics, (New March 2000) 5 Marketing 5 Water pollution 5