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![Seismograph - spgr cgs02130.jpg Seismograph - spgr](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_cgs02130.jpg?itok=-LzAQV7h)
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https://www.noaa.gov/media/digital-library-photo/pl23cgs02130jpgDescription
Seismograph - spgr.
Collection
Historic Coast & Geodetic Survey
Keywords
Coast and Geodetic Survey
Geophysics Seismology