Dissertations 449 Dissertations, Academic 438 Purification 300 Small business 185 Sewage 182 Management 176 Business enterprises 149 Water 125 International business enterprises 87 Islam 83 English language 80 Entrepreneurship 72 Business 71 Finance 71 Environmental aspects 69 Social responsibility of business 67 Case studies 65 Business English 64 Biological treatment 61 Religious aspects 60 Corporations 57 Business logistics 52 Economic aspects 52 Business planning 44 Business ethics 43 Electronic commerce 41 Data processing 40 Real estate business 40 Study and teaching 40 Marketing 38