Potomac Aqueduct, hydrographic survey of the Potomac River near Georgetown : shewing the position of the Aqueduct, its connection with the Ch. & Ohio Canal on the north bank, and with the Alexandria Canal on the south bank of the river /

"Survey made in the fall of 1832."Relief shown by hachures. Depths shown by contours and soundings.From the papers of the Virginia-District of Columbia Boundary Commission.Rubber-stamped and annotated in ink on recto and verso: District of Columbia-Virginia Boundary Commission ... State of Virginia Exhibit No. 63 ... Date: January 23/1935, Smith & Hulse, Official Reporters.In upper left corner: Plate 1.In right upper margin: Doc. 261