| Online link | http://pubs.er.usgs.gov/publication/ofr98476 |
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| Originators | Seal, Robert R. II; Hammarstrom, Jane M.; Southworth, C. Scott; Meier, Allen L.; Haffner, David P.; Schultz, Arthur P.; Plumlee, Geoffrey S.; Flohr, Marta J.; Jackson, John C.; Smith, Steven M.; and Hageman, Philip L. |
| Publication | U.S. Geological Survey Open-File Report 98-476 |