Teachers Training of 369 In-service training 83 Education 73 Teaching 39 Congresses 37 Study and teaching 34 History 30 Rating of 29 Biography 26 Salaries, etc 19 Psychology 18 Attitudes 14 Collective bargaining 14 Legal status, laws, etc 14 Supply and demand 14 Curricula 13 Periodicals 13 Research 12 Selection and appointment 12 Universities and colleges 12 Education, Higher 11 Evaluation 11 Certification 10 Vocational guidance 10 Educational innovations 9 Teacher morale 9 Teachers colleges 9 Handbooks, manuals, etc 8 Teachers' unions 8