History 156 Pests 135 Indigenous peoples 97 Philosophy 76 Insect pests 74 Dissertations, Academic (Ph.D) 69 Education 69 Politics and government 66 People with disabilities 61 Entomology 59 Plant Pests, (New March 2000) 58 Agriculture 57 India 57 Tribes 52 Scheduled tribes 51 Thesis (Ph.D)-Education 50 Plant pests 49 Rural development 48 Older people 46 Pest control 46 Social conditions 46 Social life and customs 46 Finance 45 Tamil (Indic people) 44 Population 43 Social Sciences 41 Communication 40 Untouchables 40 Nutrition 39 Industries 38