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: The United States Geological Survey (USGS) completed a mapping challenge for fire stations in Ohio, Kentucky, and Indiana.

: Fairfax County, Virginia, released its Lake Accotink Dredging Alternatives Analysis Report , outlining strategies for the park's long-term health. 122321

The identifier most commonly refers to the date December 23, 2021 , or specific chemical and technical catalog numbers. 1. Significant Events on 12/23/21 : The United States Geological Survey (USGS) completed