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List of United States cities by population - Wikipedia
Cities | Journal | ScienceDirect.com by Elsevier
List of largest cities - Wikipedia
World's 100 Best Cities | World’s Best Cities
City - Wikipedia
City | Definition & History | Britannica
A brief history of cities and urbanization | Britannica
Cities & Towns Portal | Britannica
City - Simple English Wikipedia, the free encyclopedia
The History of Cities - National Geographic Society