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| | Mount Saint Helens, OR/WA 30' x 60' quad - Pacific NW geologic mapping and urban hazards |
 | | Evarts, R.C. and Ashley, R.P., 1993, Geologic map of the Cowlitz Falls quadrangle, Lewis and Skamania Counties, Washington: U.S. Geological Survey, Geologic Quadrangle Map GQ-1682, scale 1:24000. |
 | | Evarts, R.C. and Ashley, R.P., 1993, Geologic map of the Vanson Peak quadrangle, Lewis, Cowlitz, and Skamania Counties, Washington: U.S. Geological Survey, Geologic Quadrangle Map GQ-1680, scale 1:24000. |
 | | Livingston, V.E., Jr., 1966, Geology and mineral resources of the Kelso-Cathlamet area, Cowlitz and Wahkiakum Counties, Washington [Figure 22]: Washington Division of Mines and Geology, Bulletin 54, scale 1:24000. |
| wrgis.wr.usgs.gov /wgmt/pacnw/100msh.html (446 words) |
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