Universities and colleges 65,842 Urbanization 24,086 Underground movements 23,937 Unemployment 20,376 Urban renewal 16,998 Unemployed 12,824 U.S. states 10,363 Utopias 9,561 Unemployment insurance 9,409 Urban policy 9,263 United States 9,216 Usage 9,146 Urban transportation 7,419 Unitarian churches 6,431 Ultra-Orthodox Jews 5,956 Urdu literature 5,804 Uniforms 5,802 Unitarianism 5,740 User interfaces (Computer systems) 5,700 Underground movements, War 5,628 Ulama 5,365 Ukrainians 5,170 Urdu poetry 5,158 Ukrainian language 5,134 Ukrainian literature 4,953 Ukraine 4,292 User Interfaces and Human Computer Interaction 3,968 Urban ecology (Sociology) 3,925 Utilization 3,853 Universalism 3,809 Upper class 3,627 Usury 3,553 Unitarian Universalist churches 3,266 Urban poor 3,185 Underground press publications 3,149 Union catalogs 3,122 Ukiyoe 3,081 Urban economics 3,024 Urdu language 2,789 Universities 2,688 Union lists 2,492 Underwater archaeology 2,387 United Nations 2,339 Unitarians 2,071 Uncles 2,045 Undocumented immigrants 2,036 Underground literature 2,015 Uranium 2,015 Urology 1,979 Uncertainty 1,957 Urban, Rural and Regional Development 1,919 Utopias in literature 1,861 Ukrainian poetry 1,837 Universités 1,825 Urinary organs 1,819 Urbanisation 1,800 Uterus 1,785 User charges 1,770 Urine 1,728 Unity 1,683 Unidentified flying objects 1,663 Urdu fiction 1,627 Uranium ores 1,603 Undercover operations 1,595 Urban beautification 1,548 Urbanisme 1,510 Urban 1,490 Utilitarianism 1,462 Ubiquitous computing 1,452 Ultrasonic imaging 1,421 Ukrainian 1,420 Urban geography 1,383 Urban transportation policy 1,327 Ukraine Conflict, 2014- 1,326 Unmarried mothers 1,325 Upper atmosphere 1,323 Unitarian Universalists 1,318 Urologic Diseases 1,316 Ultrasonography 1,315 Urban landscape architecture 1,296 Universalist churches 1,253 Unified operations (Military science) 1,233 Unmarried couples 1,208 University extension 1,201 Usury laws 1,151 Unemployment rate 1,141 Ultraviolet radiation 1,119 Uighur (Turkic people) 1,109 UE/CE Etats membres 1,089 Urdu 1,085 Underground Railroad 1,056 Uranium mines and mining 1,041 Urban runoff 1,041 Universalists 1,031 Urban ecology (Biology) 990 Undocumented Immigrants 986 Umbanda (Cult) 980 Urban health 951 Unternehmen 946 Urban youth 946