Research & information: general 2,212 Religion & beliefs 773 Regional studies 572 Religion: general 303 Religious groups: social & cultural aspects 221 Regional & national history 202 Research methods: general 164 Refugees & political asylum 131 Regional & area planning 128 Research & development management 121 Religion & politics 112 Regional government 104 Regional geography 97 Robotics 96 Radiology 91 Reference, information & interdisciplinary subjects 71 Rural communities 69 Religious issues & debates 56 Roman Catholicism, Roman Catholic Church 48 Russia 44 Revolutions, uprisings, rebellions 35 Reliability engineering 34 Respiratory medicine 30 Reproductive medicine 29 Religious ethics 27 Religion & science 26 Religious buildings 26 Regional government policies 22 Residential buildings, domestic buildings 21 Religious life & practice 20 Rural planning 20 Reportage & collected journalism 18 Revolutionary groups & movements 18 RND 17 Religious aspects of sexuality, gender & relationships 17 Rehabilitation 16 Religious intolerance, persecution & conflict 16 Rock & Pop music 16 Radio 15 Renaissance art 15 RNU 14 Rocks, minerals & fossils 14 Romance 13 Russian 13 Reference works 12 Rehabilitation: brain & spinal injuries 12 Relativity physics 12 Renal medicine & nephrology 12 Road & motor vehicles: general interest 12 Religious fundamentalism 11 Religious subjects depicted in art 11 Romance, Italic & Rhaeto-Romanic languages 10 Russian Revolution 10 RPC 9 Republic of South Africa 9 Radio & television industry 8 Religious instruction 8 Risk assessment 8 Religious institutions & organizations 7 Rap & Hip-Hop 6 Regulation of medicines & medical devices 6 Rehabilitation of offenders 6 Religious & theocratic ideologies 6 Religious freedom / freedom of worship 6 Responsibility of states & other entities 6 Roman religion & mythology 6 Reading skills 5 Road vehicle manufacturing industry 5 RGC 4 Radiotherapy 4 Real time operating systems 4 Reception / Early Childhood Development Grade R or Grade 0 (South Africa) 4 Religious counselling 4 Religious social & pastoral thought & activity 4 Reptiles & amphibians as pets 4 Retail sector 4 Rheumatology 4 Role-playing, war games & fantasy sports 4 Romania 4 Romantic music (c 1830 to c 1900) 4 RB 3 RG 3 Radio technology 3 Road transport industries 3 Rwanda 3 RBGB 2 RNK 2 RNT 2 RPT 2 Radio scripts 2 Railway technology, engineering & trades 2 Railway trades 2 Regional anatomy 2 Regulation of legal profession 2 Religious & spiritual fiction 2 Religious communities & monasticism 2 Restitution 2 Roman law 2 Romanian 2 RGCP 1