| Online link | http://pubs.usgs.gov/sir/2006/5203/ |
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| Originators | Foley, Nora K.; Ayuso, Robert A.; Ayotte, Joseph D.; Montgomery, Denise L.; and Robinson, Gilpin R. Jr. |
| Publication | U.S. Geological Survey Scientific Investigations Report 2006-5203 This publication is available only as a PDF document. |