Leveling inside the Washington Monument. Edward E. Carlson is holding the rod
and David B. Crockett is making observations with the leveling instrument.
Image ID: geod0532, NOAA's Geodesy Collection
Location: Washington, D. C.
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
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June 10, 2016