README for U.S. Geological Survey Data Series 661 (Database for
Bulletin 1847) Database for Potential Hazards from Future
Volcanic Eruptions in California
By Melissa N. White, David W. Ramsey, and C. Dan Miller

This database was created using ArcGIS 9.3.1 personal
geodatabase format and consists of feature datasets
containing\volcano hazards map feature classes for each of the
six geographic areas depicted on Plate 1 of U.S. Geological
Survey Bulletin 1847. ArcGIS-compatible GIS software is
therefore required to use the files of this database. The
geodatabase is stored in a single zipped folder (777 KB in size)
in this release for ease of transfer. The scale of the source
maps limits the spatial resolution (scale) of the database to
1:500,000 or less detailed.