Animal behavior 50
Reproduction 50
United States History 46
American literature History 27
Religions 25
Hospitals Case management services 23
Musical form 23
Style, Musical 23
Physical geography 22
Assassination 21
Communicable diseases 21
Health planning 21
Infection 21
Medicine Research 21
Social medicine 21
Political participation 20
Epidemiology 19
Medical microbiology 19
Ethnicity 18
Operas Analysis, appreciation 17
Natural resources 16
United States History Study and teaching 16
Mechanical engineering 15
African Americans History 14
Television soundtracks 14
United States Politics and government 14
Vocational education 13
Environmental policy 12
Frontier and pioneer life 12
Indians of North America History 12
Music Performance 12
Population 12
Christianity 11
Conservation of natural resources 11
Multiculturalism 11
United States Economic conditions 11
West (U.S.) History 11
Alternative rock music 10
Biography 10
Electricity Study and teaching 10
Ethics 10
Punk rock music 10
Rites and ceremonies 10
Sports 10
Antiquities 9
Astronomy 9
Biology Research 9
Biotechnology 9
Criticism, interpretation, etc 9
Environmental protection 9
Europe Antiquities 9
Mechanics 9
Music 9
Politicians 9
Presidents 9
Religious leaders 9
Biodiversity 8
Civilization, Ancient 8
Criticism and interpretation 8
Cultural geography 8
Depressions 8
Ecology 8
Labor History 8
Literature History and criticism 8
Musicians 8
Outlaws 8
Social ecology 8
Substance abuse 8
United States Territorial expansion 8
American poetry Study and teaching 7
American poetry Study and teaching (Higher) 7
Career goals 7
Courts 7
Evolution (Biology) 7
Immigrants 7
India 7
Literature Study and teaching 7
Marine biology 7
Medical social work 7
Music Instruction and study 7
Poetics 7
Poets, American 7
Political planning 7
Religion and sociology 7
Religious institutions 7
Religious life 7
Self-consciousness (Awareness) 7
Self-evaluation 7
Technology Social aspects 7
Animal migration 6
Animals 6
Art Political aspects 6
Civil engineering 6
Conservation of natural resources Government policy 6
Constitutional history 6
Diseases 6
Ecosystem management 6
Environmental sciences Study and teaching 6
Families 6
Institutionalism (Religion) 6