Congresses 217 Education 140 Bibliography 138 Study and teaching 134 Research 127 History 123 Periodicals 123 Criticism and interpretation 78 City planning 73 Universities and colleges 69 English language 60 Economic conditions 47 Planning 45 Social work education 45 Land use 44 Mathematics 44 Directories 43 Education, Higher 43 Study and teaching (Secondary) 42 Exhibitions 41 Economic aspects 40 Environmental aspects 39 Housing 39 Training of 39 Science 38 Employment 37 Management 37 Older people 37 Regional planning 37 Social service 37