Education 55 History 15 Public schools 13 Congresses 8 Finance 7 Teachers 7 Training of 6 Education and state 5 Comparative education 4 Economic aspects 4 Primary school teachers 4 School management and organization 4 Study and teaching (Secondary) 4 Collective bargaining 3 Federal aid to education 3 Research 3 Afro-Americans 2 Education, Preschool 2 Education, Secondary 2 Educational planning 2 Educational sociology 2 Industry and education 2 Mathematics 2 Mentally handicapped children 2 Periodicals 2 Religion in the public schools 2 Rural schools 2 Salaries, etc 2 Schools 2 Science teachers 2