History 186 Research 139 Methodology 88 Social sciences 83 Social aspects 82 Management 57 Social conditions 54 Economic conditions 53 Law and legislation 52 Design and construction 48 Politics and government 47 Addresses, essays, lectures 46 Vocational education 46 Counterculture 43 Economic integration 37 Technique 37 Economic aspects 36 Subculture periodicals 36 Women 35 Mass media 33 Data processing 32 Psychological aspects 32 Environmental aspects 30 History and criticism 30 Occupational training 30 Exhibitions 29 Pictorial works 29 Philosophy 28 Plastics 27 Regional planning 27