Universities and colleges 65,835 Urbanization 24,083 Underground movements 23,931 Unemployment 20,375 Urban renewal 16,992 Unemployed 12,824 U.S. states 10,364 Utopias 9,556 Unemployment insurance 9,408 Urban policy 9,262 United States 9,211 Usage 9,142 Urban transportation 7,419 Unitarian churches 6,432 Ultra-Orthodox Jews 5,954 Uniforms 5,801 Urdu literature 5,783 Unitarianism 5,740 User interfaces (Computer systems) 5,699 Underground movements, War 5,628 Ulama 5,359 Ukrainians 5,169 Ukrainian language 5,131 Urdu poetry 5,099 Ukrainian literature 4,953 Ukraine 4,290 User Interfaces and Human Computer Interaction 3,968 Urban ecology (Sociology) 3,922 Utilization 3,852 Universalism 3,809 Upper class 3,626 Usury 3,552 Unitarian Universalist churches 3,265 Urban poor 3,185 Underground press publications 3,149 Union catalogs 3,121 Ukiyoe 3,079 Urban economics 3,024 Urdu language 2,789 Universities 2,689 Union lists 2,492 Underwater archaeology 2,387 United Nations 2,341 Unitarians 2,071 Uncles 2,044 Undocumented immigrants 2,036 Uranium 2,015 Underground literature 2,014 Urology 1,979 Uncertainty 1,956 Urban, Rural and Regional Development 1,919 Utopias in literature 1,860 Ukrainian poetry 1,837 Universités 1,823 Urinary organs 1,819 Urbanisation 1,795 Uterus 1,785 User charges 1,770 Urine 1,727 Unity 1,681 Unidentified flying objects 1,662 Uranium ores 1,603 Urdu fiction 1,603 Undercover operations 1,594 Urban beautification 1,549 Urbanisme 1,512 Urban 1,489 Utilitarianism 1,461 Ubiquitous computing 1,448 Ultrasonic imaging 1,421 Ukrainian 1,420 Urban geography 1,383 Urban transportation policy 1,327 Ukraine Conflict, 2014- 1,326 Unmarried mothers 1,324 Upper atmosphere 1,323 Unitarian Universalists 1,318 Urologic Diseases 1,316 Ultrasonography 1,315 Urban landscape architecture 1,295 Universalist churches 1,253 Unified operations (Military science) 1,233 Unmarried couples 1,208 University extension 1,201 Usury laws 1,150 Unemployment rate 1,141 Ultraviolet radiation 1,119 Uighur (Turkic people) 1,109 UE/CE Etats membres 1,103 Urdu 1,083 Underground Railroad 1,056 Uranium mines and mining 1,041 Urban runoff 1,041 Universalists 1,031 Urban ecology (Biology) 989 Undocumented Immigrants 986 Umbanda (Cult) 980 Urban health 951 Unternehmen 949 Urban youth 946