Map of n. eastern Virginia and vicinity of Washington surveys for military defenses / compiled at Topographical Engineers office at Division headquarters ofGeneral Irvin McDowell.
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."
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