City planning 15 Economic conditions 5 Historic buildings 3 Buildings, structures, etc 2 Capital investments 2 Conservation and restoration 2 Description and travel 2 more ... Finance, Public 2 History 2 Housing 2 Municipal revenue 2 Municipal services 2 Population 2 Roads 2 Statistics 2 American Revolution Bicentennial, 1976 1 Census districts 1 Community development 1 Computer-aided design 1 Design and construction 1 Dwellings 1 Economic aspects 1 Education 1 Express highways 1 Local finance 1 Local transit 1 Occupations 1 Penn 1 Periodicals 1 Population density 1 Retail trade 1 Social conditions 1 Tourism 1 Tourist information centers 1 Traffic engineering 1 Traffic surveys 1 Transportation 1 Urban renewal 1 less ...