http://pubs.usgs.gov/sim/2006/2895/vlreadme.txt

  Description of digital dataset files posted on this 
  website:

  vlreadme.txt - this file

  vlmeta.txt - FGDC compliant metadata. Each Geodatabase 
  Feature Class also has its own metadata.

vl_db.zip - Zipped package of files necessary to create an 
       ArcMap Personal Geodatabase project.  Includes:
  -- readme_vldb.txt
  -- valle100k.style
  -- valle100k.zip - Personal Geodatabase
  -- vl_base.zip

  vl_shape.zip - The authors have converted feature classes 
       to shapefiles and created a style file to facilitate 
       use of the data in ArcMap and other applications. 
       Includes:
  -- readme_vlshape.txt
  -- valle100k.style
  -- valle_shapefiles.zip
  -- vl_base.zip