History 134 Geology 67 Design and construction 45 Planning 38 Antiquities 37 Law and legislation 35 World War, 1939-1945 33 Environmental aspects 29 Local government 29 Public housing 28 Hospitals 27 Finance 26 HISTORY 26 Social conditions 26 Children 24 Economic aspects 24 Management 24 Safety measures 23 Guide-books 21 Housing 21 Sources 21 Evaluation 20 Description and travel 19 Employment 19 Regional planning 19 Services for 19 Administration 18 Economic conditions 18 Education 17 Airports 16