History 397
Study and teaching 381
Social life and customs 129
Education 124
Vietnam War, 1961-1975 114
Students 109
Conduct of life 108
Activity programs 102
Classroom management 102
Science 101
Teachers 95
Hunting 92
Rural families 92
Self-reliant living 92
Survivalism 92
Wilderness areas 92
Politics and government 90
Animals 82
World War, 1939-1945 80
Behavior modification 77
Career development 71
Teaching 66
Training of 66
Study and teaching (Secondary) 65
Technology 59
Mathematics 57
Study and teaching (Primary) 53
Behavior disorders in children 50
Educational tests and measurements 50
Educational technology 47
English language 47
Prisoners 46
Civilization 45
Curricula 42
Prisons 41
Popular music 39
Airplanes 38
Economic conditions 37
Natural history 37
Crime 36
Social conditions 36
Vietnam Conflict 35
Foreign relations 34
Parent participation 34
African Americans 33
Behavior Therapy 33
Career Mobility 33
Prisoners' songs 33
Celebrities 32
Early childhood education 32
Criminal investigation 31
Curiosities and wonders 31
Military weapons 31
Aeronautics 30
Art 30
Foreign speakers 30
Rating of 30
Methods 28
Murder 28
Reading 28
Research 28
School principals 28
Campaigns 27
Dancers 27
Design and construction 27
Ecology 27
Veterans 27
Airplanes, Military 26
Schools 26
Ability testing 25
Design 25
Education, Secondary 25
Educational leadership 25
Fishing 25
Race relations 25
Genealogy 24
Korean War, 1950-1953 24
Special education 24
Ballet 23
Citizenship 23
Literacy 23
Physical education and training 23
Conduct disorders in children 22
Criminals 22
Human ecology 22
Trapping 22
Animal behavior 21
Choreographers 21
Educational Technology 21
Military assistance, American 21
Parole 21
Basic training (Military education) 20
Criticism and interpretation 20
Dance 20
Nutrition 20
Prevention 20
Aids and devices 19
Cooking 19
Cosmology 19
Environmental policy 19