Relief shown by hachures. "Arlington, January 1st 1862 from published and manuscript maps corrected by recent Surveys and Reconnaissances." "Engraved on stone by J. Schedler No. 120 Pearl St. N.Y." Includes table of "Elevations above tide water", "Geological profile of Loudoun County" and list of "Data used in compilation." 1 map: mounted on cloth; 167 x 127 cm