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Chart of the head of navigation of the Potomac River : surveyed by order of the Sec. of War for the Corporation of Georgetown D.C. with a view to the improvement of the Georgetown Channel /

Chart of the head of navigation of the Potomac River : surveyed by ord...

Relief shown by hachures. Depths shown by contours and soundings. Oriented with north toward the upper left. Includes note. LC copy fold-lined, laminated, halved, and mounted on cloth backing. Available also th... More