pl23_cgs01991.jpg
![Rod driven to refusal in permafrost used as vertical survey control mark cgs01991.jpg Rod driven to refusal in permafrost used as vertical survey control mark](https://s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_cgs01991.jpg)
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https://www.noaa.gov/media/digital-library-photo/pl23cgs01991jpgDescription
Rod driven to refusal in permafrost used as vertical survey control mark.
Collection
Historic Coast & Geodetic Survey