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Note establishing contour interval and mean high water of Potomac River as vertical datum for elevations. Picture

Note establishing contour interval and mean high water of Potomac River as vertical datum for elevations.

Note establishing contour interval and mean high water of Potomac River as vertical datum for elevations.

Photo Category: Coast and Geodetic Survey - Archive Topographic Survey
Photo Location: Virginia, Maryland, Washington, D.C. Potomac River
Photo Date: 1881

Author: NOAA

License: Public Domain Mark 1.0 (Public domain)
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20th October 2015
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