U.S. Geological Survey Data Series 577
The map documents and shapefiles used to create the maps provided in this report can be downloaded from the GIS Project (216 MB) folder. This folder also contains a read-me file that describes the project in detail. Map documents were created with ESRI ArcGIS version 10 software. The shapefiles (SHP) and raster (TIFF) data provided may also be viewed using other versions of ArcGIS, Open GIS, or the public domain software ArcExplorer (http://www.esri.com/software/arcexplorer/).