Public relations Police 23 Libraries 19 Corporations 17 History 14 Marketing 13 Advertising 8 Management 7 Corporate image 6 Museums 5 Social aspects 5 Addresses, essays, lectures 4 Information services 4 Local government 4 Mass media 4 Mass media and business 4 Sports 4 Advocacy advertising 3 Crisis management 3 Educational aspects 3 Library planning 3 Municipal government 3 Planning 3 Research 3 Social responsibility of business 3 Universities and colleges 3 Armed Forces 2 Armed Forces and mass media 2 Art museums 2 Brand name products 2