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Social conditions 7 City planning 5 Education, Urban 4 Urban residence 4 Cities and towns 3 Community development, Urban 3 Rural-urban migration 3 Urban renewal 3 African American teenagers 2 Community development 2 Economic conditions 2 Indians of North America 2 Prevention 2 Problem children 2 School improvement programs 2 Social life and customs 2 Technological innovations 2 Urban policy 2 Urban youth 2 Urbanization 2 Aboriginal Australians 1 Adolescence 1 Adoption 1 African American teenage boys 1 African American youth 1 African Americans 1 Athletes 1 Bacterial diseases 1 Biotechnology 1 Boys 1