UIUC 82,351 United States 70,121 Universities and colleges 28,537 Urbanization 6,920 U.S. states 5,873 Underground movements 5,057 Urban renewal 5,057 Unemployment 3,760 Unemployed 3,671 Utopias 3,433 Urban policy 3,199 Urban transportation 2,892 Usage 2,673 Ukrainians 2,001 User interfaces (Computer systems) 1,845 UE/CE Etats membres 1,826 Ukrainian literature 1,814 Ukrainian language 1,794 Urbanisme 1,738 Utilization 1,712 Unemployment insurance 1,632 Unitarianism 1,602 USA 1,520 UNITED STATES 1,355 Universalism 1,347 Upper class 1,332 Urban economics 1,308 Urban ecology (Sociology) 1,290 Urdu literature 1,256 Urban poor 1,241 Ukraine 1,240 Unidentified flying objects 1,186 Unternehmen 1,154 Uncles 1,135 Usury 1,126 Uranium ores 1,119 Undercover operations 1,097 Umweltschutz 1,095 Universités 1,088 Unterricht 1,076 Urology 1,068 Uniforms 1,040 Universities 1,035 Umweltpolitik 1,006 Uranium 1,002 Ubiquitous computing 986 Underground movements, War 923 Urdu poetry 915 Uncertainty 881 Urologic Diseases 869 Ultrasonic imaging 853 Übersetzung 847 Urban 836 Underground press publications 758 Urban runoff 752 Unitarian churches 749 Urdu language 718 Ultrasonography 710 Utilitarianism 700 Unified operations (Military science) 699 Union lists 692 Underwater archaeology 688 Utopias in literature 681 University extension 669 Union catalogs 662 Underground Railroad 660 Unity 639 Unmarried mothers 638 Unitarian Universalist churches 626 User charges 616 Umwelt 571 Urbanisation 562 Underground press 544 Uranium mines and mining 541 Urban schools 536 Ukrainian 529 Urinary organs 529 Underground dance music 525 Ukrainian poetry 523 Urban transportation policy 522 Ulama 521 UML 513 Universität 498 Ultrasonics 493 User-centered system design 492 Underwater exploration 487 Ultraviolet radiation 484 User Interfaces and Human Computer Interaction 484 Urban youth 478 Undertakers and undertaking 474 Ukiyoe 464 Unrequited love 447 Uncertainty (Information theory) 444 Underground literature 443 Use 442 Usury laws 440 Urine 438 Underground storage 409 Underwater acoustics 407 Underground construction 403