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In answer to the querry: " "National Geodesic Survey" is inscribed on it. Can
anyone tell us what this means?"
It is most likely stamped "National Geodetic Survey". To quote from the
Coastal Mapping Handbook: The National Geodetic Survey [under the National
Ocean Service all under NOAA] ...is responsible for establishing and
maintaining the Nation's horizontal and vertical control networks. You might
call 301-713-2877 (Horizontal Control section) if you need more info.
Greg Durocher
USGS-ESIC, Alaska