Sketch showing the triangulation of the principal Defenses of the District of Columbia executed under the general direction of Col. J. N. Macomb, U. S. Topl. Engrs., by Charles A. Schott, Asst., U. S. Coast Survey, January to May 1863.
Summary
Maryland, the District of Columbia, and the Potomac River
Tags
sketch
triangulation
defenses
columbia
direction
macomb
topl
engrs
charles
schott
asst
coast
survey
coast survey
colonel
maryland
washington dc
potomac river
district of columbia
Date
18/08/1863
Source
The U.S. National Archives
Link
Copyright info
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