- Pacific Northwest Seismograph Network
Operates seismograph stations, locates earthquakes in Washington, and disseminates information on regional earthquake and geologic hazard activity.
http://www.geophys.washington.edu/SEIS/PNSN/
- Washington State Rockhounding
Trips and photos, classifieds, site map, weather forecast, government contacts, and further reading.
http://www.washington-state-rockhounding.info/
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