Image:Drum recorders.jpg
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Drum recorder seismographs
Taken from http://quake.wr.usgs.gov/recent/helicorders/index.html
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This image is a work of a United States Geological Survey employee, taken or made during the course of the person's official duties. As a work of the United States Government, the image is in the public domain. For more information, see the USGS copyright policy. See Wikipedia:Public domain and Wikipedia:Copyrights for more details. |  |
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 01:02, 24 June 2004 | 200×183 (9 KB) | Ed g2s (Talk | contribs) | (Drum recorder seismographs) |
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