| Original language | English |
|---|---|
| Publisher | U.S. Geological Survey |
| Number of pages | 6 |
| Publication status | Published - 2011 |
| Externally published | Yes |
Publication series
| Name | U.S. Geological Survey Fact Sheet |
|---|---|
| Publisher | U.S. Geological Survey |
| Volume | 2011-3072 |
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