Below are some links related to city :

1. http://egov.cityofchicago.org
2. http://en.wikipedia.org/wiki/Sears_Tower (Sear tower information)
3. http://en.wikipedia.org/wiki/Chicago (Complete information about chicago)
4. http://www.ohare.com (Chicago Ohare airport)
5. http://www.chicagoinfo.gov (Govt related services for city)
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