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Determining the Elevations
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Coast-Geodetic-Survey
Geodesy
Determining the Elevations
Rodman holding rod vertical during observations.
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Rodman holding rod vertical during observations.
3/18/2019 12:28:26 PM
Date:
1900?
Credit:
NOAA, John Hayford Album
Subject:
Geodesy
Subject:
Leveling
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