Universities and colleges 65,843 Urbanization 24,092 Underground movements 23,941 Unemployment 20,376 Urban renewal 17,003 Unemployed 12,824 U.S. states 10,363 Utopias 9,561 Unemployment insurance 9,409 Urban policy 9,265 United States 9,215 Usage 9,147 Urban transportation 7,421 Unitarian churches 6,426 Ultra-Orthodox Jews 5,956 Urdu literature 5,808 Uniforms 5,802 Unitarianism 5,728 User interfaces (Computer systems) 5,704 Underground movements, War 5,628 Ulama 5,368 Urdu poetry 5,174 Ukrainians 5,172 Ukrainian language 5,134 Ukrainian literature 4,953 Ukraine 4,293 User Interfaces and Human Computer Interaction 3,972 Urban ecology (Sociology) 3,927 Utilization 3,855 Universalism 3,799 Upper class 3,628 Usury 3,553 Unitarian Universalist churches 3,264 Urban poor 3,186 Underground press publications 3,149 Union catalogs 3,122 Ukiyoe 3,080 Urban economics 3,026 Urdu language 2,791 Universities 2,689 Union lists 2,493 Underwater archaeology 2,387 United Nations 2,338 Unitarians 2,070 Uncles 2,047 Undocumented immigrants 2,036 Uranium 2,017 Underground literature 2,015 Urology 1,979 Uncertainty 1,959 Urban, Rural and Regional Development 1,919 Utopias in literature 1,861 Ukrainian poetry 1,837 Universités 1,827 Urinary organs 1,819 Urbanisation 1,803 Uterus 1,785 User charges 1,770 Urine 1,728 Unity 1,682 Unidentified flying objects 1,663 Urdu fiction 1,632 Uranium ores 1,604 Undercover operations 1,596 Urban beautification 1,549 Urbanisme 1,511 Urban 1,490 Utilitarianism 1,462 Ubiquitous computing 1,454 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 1,209 University extension 1,201 Usury laws 1,151 Unemployment rate 1,141 Ultraviolet radiation 1,119 Uighur (Turkic people) 1,109 Urdu 1,085 UE/CE Etats membres 1,082 Underground Railroad 1,057 Uranium mines and mining 1,041 Urban runoff 1,041 Universalists 1,029 Urban ecology (Biology) 990 Undocumented Immigrants 986 Umbanda (Cult) 980 Urban health 953 Urban youth 946 Ukrainian fiction 945