- britannica.com place/Washington-DCWashington, D.C., capital of the United States, coextensive with the District of Columbia, located on the northern shore of the Potomac River.
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- newworldencyclopedia.org entry/Washington,_D.C.Kohler, Sue A., and Pamela Scott. Designing the Nation's Capital: The 1901 Plan for Washington, D.C. Washington, DC: U.S. Commission of Fine Arts, 2006.
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- The Official Washington DC tourism guide for hotels, motels, bars, nightclubs, events and attractions.
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