Literature 112 History 104 Rural poor 98 Photonics 93 Python (Computer program language) 90 Poor 82 Library classification schemes 65 Literature Hindi 62 Biography 55 India 52 Poverty 48 Criticism and interpretation 47 Philosophy 44 Colonization 39 Rural development 37 Social Sciences 37 Criticism 36 Education 33 Social conditions 33 English literature 32 Toxicology 30 History and criticism 29 English poetry 27 Hindi literature 25 Dissertations, Academic (Ph.D) 24 Optoelectronic devices 23 Poetry 23 Psychology 21 Colon classification 20 Dalits 20