Point of Rocks from Potomac, " Jackson & Co., Denver", "111" and "1789" on negative., Commissioned by Baltimore & Ohio Railroad., Detroit Publishing Co. no. 01789., Gift; State Historical Society of Colorado; 1949, Rivers. , Bridges. , Construction. , United States, Maryland, Point of Rocks. , United States, Potomac River.

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Keywords: ., bridges., construction., rivers., states--maryland--, united