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This resource has 1,167,234 citations, the following are the top 20 citations* as of Sun Nov 23 12:16:10 PST 2008.
- United States Geological Survey (USGS)
- Department of the Interior
- USGS Earthquake Hazards Program
- Recreation.gov
- Science.gov
- USGS Water Resources of the United States
- USGS Earthquake Hazards Program - Northern California
- TerraFly
- This Dynamic Earth--Contents [USGS]
- U.S. Geological Survey Volcano Hazards Program
- USGS Cascades Volcano Observatory (CVO)
- USGS Hawaiian Volcano Observatory (HVO)
- Latest Earthquakes in the World - Past 7 days
- Water Science for Schools (USGS): All about water!
- National Biological Information Infrastructure (NBII)
- USGS Cascades Volcano Observatory (CVO)
- U.S. Geographic Names Information System
- USGS National Earthquake Information Center
- U.S. Geographic Nameserver
- NEIC: Worldwide Earthquake Activity in the Last Seven Days
* If you are looking for more geologic resources it's common to find them in our citations.


