History 53 Dissertations, Academic (Ph.D) 45 Microbiology 41 Patents 38 Atlas 33 Anatomy 31 Economics 28 Atlases 27 Histology 27 Rural development 24 Biological control agents 23 Biotechnology 23 Natural enemies 23 India 22 Pharmacology and Toxicology 22 Women 22 Biological Control 21 Biological control 21 Patent laws and legislation 21 Politics and government 21 Economic development 19 Intellectual property 19 Pathology 19 Underdeveloped areas 19 Medical microbiology 18 Plant Pathology 17 Antineoplastic agents 16 Plant Pests, (New March 2000) 16 Tourism 16 Medicine 15