Ewert, John W. (1992). "Monitoring Volcanoes: Techniques and Strategies Used by the Staff of the Cascades Volcano Observatory, 1980-90: U.S. Geological Survey Bulletin 1966" (Document). United States Geological Survey. {{cite document}}: Cite has empty unknown parameters: |version= and |accessdate= (help); Unknown parameter |coauthors= ignored (|author= suggested) (help); Unknown parameter |format= ignored (help); Unknown parameter |url= ignored (help)
Hoblitt, R. P. (1987). "Volcanic Hazards with Regard to Siting Nuclear-Power Plants in the Pacific Northwest: U.S. Geological Survey Open-File Report 87-297" (Document). United States Geological Survey. {{cite document}}: Cite has empty unknown parameters: |version= and |accessdate= (help); Unknown parameter |coauthors= ignored (|author= suggested) (help); Unknown parameter |format= ignored (help); Unknown parameter |url= ignored (help)
Miller, C. Dan (1989). "Potential Hazards from Future Volcanic Eruptions in California: U.S. Geological Survey Bulletin 1847" (Document). United States Geological Survey. {{cite document}}: Cite has empty unknown parameters: |version= and |accessdate= (help); Unknown parameter |format= ignored (help); Unknown parameter |url= ignored (help)
Johnston, David A. (1981). "Guides to Some Volcanic Terranes in Washington, Idaho, Oregon, and Northern California: U.S. Geological Survey Circular 838" (Document). United States Geological Survey. {{cite document}}: Cite has empty unknown parameters: |version= and |accessdate= (help); Unknown parameter |coauthors= ignored (|author= suggested) (help); Unknown parameter |format= ignored (help); Unknown parameter |url= ignored (help)
Childs, Jonathan R. (2000). "Bathymetric, geophysical and geologic sample data from Medicine Lake, Siskiyou County, northern California - Open File Report OF 00-043" (Document). United States Geological Survey. {{cite document}}: Cite has empty unknown parameter: |accessdate= (help); Unknown parameter |coauthors= ignored (|author= suggested) (help); Unknown parameter |format= ignored (help); Unknown parameter |url= ignored (help); Unknown parameter |version= ignored (help)