Universities and colleges 65,896 Urbanization 24,109 Underground movements 23,958 Unemployment 21,416 Urban renewal 17,023 Unemployed 12,829 U.S. states 10,353 Utopias 9,570 Unemployment insurance 9,430 Urban policy 9,278 United States 9,202 Usage 9,155 Urban transportation 7,424 Unitarian churches 6,427 Ultra-Orthodox Jews 5,968 Urdu literature 5,810 Uniforms 5,807 Unitarianism 5,730 User interfaces (Computer systems) 5,708 Underground movements, War 5,628 Ulama 5,377 Ukrainians 5,184 Urdu poetry 5,182 Ukrainian language 5,138 Ukrainian literature 4,960 Ukraine 4,282 User Interfaces and Human Computer Interaction 3,974 Urban ecology (Sociology) 3,931 Utilization 3,855 Universalism 3,798 Upper class 3,633 Usury 3,553 Unitarian Universalist churches 3,269 Urban poor 3,195 Underground press publications 3,151 Union catalogs 3,122 Ukiyoe 3,084 Urban economics 3,029 Urdu language 2,791 Universities 2,685 Union lists 2,495 Underwater archaeology 2,391 United Nations 2,321 Unitarians 2,071 Uncles 2,047 Undocumented immigrants 2,029 Uranium 2,020 Underground literature 2,015 Urology 1,979 Uncertainty 1,962 Urban, Rural and Regional Development 1,919 Utopias in literature 1,861 Universités 1,857 Urbanisation 1,857 Ukrainian poetry 1,840 Urinary organs 1,820 Uterus 1,785 User charges 1,771 Urine 1,728 Unity 1,682 Unidentified flying objects 1,666 Urdu fiction 1,626 Uranium ores 1,604 Undercover operations 1,602 Urban beautification 1,550 Urbanisme 1,514 Urban 1,484 Utilitarianism 1,464 Ubiquitous computing 1,453 Ultrasonic imaging 1,421 Ukrainian 1,420 Urban geography 1,382 Urban transportation policy 1,329 Unmarried mothers 1,326 Upper atmosphere 1,323 Unitarian Universalists 1,320 Ultrasonography 1,317 Urologic Diseases 1,316 Ukraine Conflict, 2014- 1,315 Unemployment rate 1,302 Urban landscape architecture 1,296 Universalist churches 1,254 Unified operations (Military science) 1,233 Unmarried couples 1,209 University extension 1,200 Usury laws 1,151 Ultraviolet radiation 1,119 Uighur (Turkic people) 1,114 Urdu 1,083 Underground Railroad 1,057 Uranium mines and mining 1,041 Urban runoff 1,041 Universalists 1,029 UE/CE Etats membres 994 Urban ecology (Biology) 990 Undocumented Immigrants 987 Umbanda (Cult) 981 Urban health 956 Urban youth 947 Ukrainian fiction 945