City planning Economic conditions Population Housing Statistics Census, 1970 Social conditions Census districts Census, 1960 Description and travel Historic buildings History American Revolution Bicentennial, 1976 Buildings, structures, etc Capital investments Census, 1980 Conservation and restoration Ethnic groups Finance, Public Municipal revenue Municipal services Roads Administrative and political divisions Census, 1990 Cities and towns Community development Computer-aided design Design and construction Dwellings Economic aspects Education Express highways Indexes Local finance Local transit Occupations Penn Periodicals Planning Population density