Bill Grace on top of the Riggs Mill waterwheel, 1912. Today known as the Adelphi Mill, the Riggs Mill is both the oldest and largest mill still standing in the metropolitan Washington area. It was built about 1796 and the Riggs family owned it from the Civil War until 1920. From the Archives and Manuscripts Department photograph collection.

Currently on display with the 300 Candles: Slices of Prince George's County exhibit in the Maryland Room, 3rd floor, McKeldin Library at the University of Maryland at College Park.

Prince George's Tricentennial Home page.

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These pages were created as a part of the 1996 PG County Tricentennial celebration. Additional history resources are listed on the bibliography page. These pages are not being updated. They are now located on the Prince George's County Historical Society's web site. Contact links: web site manager - Society information. You can search the entire site through this search form.: