History 190 Research 140 Methodology 89 Social sciences 83 Social aspects 82 ARTISTS 79 Economic conditions 57 Management 57 Social conditions 54 Law and legislation 52 PAINTING 51 Design and construction 50 Politics and government 49 Vocational education 48 Addresses, essays, lectures 46 Counterculture 43 Economic integration 39 Technique 37 Economic aspects 36 Subculture periodicals 36 HISTORY 35 Women 35 Mass media 33 Data processing 32 Psychological aspects 32 History and criticism 31 Occupational training 31 Environmental aspects 30 Exhibitions 29 Pictorial works 29