History 172 Research 108 ARTISTS 79 Methodology 64 Social sciences 63 Social aspects 58 PAINTING 51 Law and legislation 50 Design and construction 49 Addresses, essays, lectures 46 Economic conditions 46 Social conditions 45 Management 43 Economic integration 39 Vocational education 36 Politics and government 34 Technique 34 HISTORY 33 Women 33 Data processing 31 Economic aspects 29 Exhibitions 28 Pictorial works 28 Psychological aspects 28 Regional planning 28 Plastics 26 Environmental aspects 25 History and criticism 24 Mass media 24 Motor vehicles 24