http://pubs.usgs.gov/of/2013/1007/

Description of digital dataset files posted on this
website:

of2013-1007_readme.txt - this file

of2013-1007_metadata.txt - FGDC compliant metadata. Each
                    geodatabase feature class also has
                    its own metadata.

sbgw_db.zip, expands to sbgw_db
   sbgw_db - Folder of files necessary to create an ArcMap
             Personal Geodatabase project.
             -- readme_sbgw_db.txt - Readme for sbgw_db
             -- sbgw_mdb - Personal Geodatabase
             -- sbgw.style - ArcMap style for
                symbolizing data
             -- f35109e1.tif - 1:100,000-scale DRG base

sbgw_shape.zip, expands to sbgw_shape:
   sbgw_shape - Folder of Feature Classes converted to
                shapefiles to facilitate use of the data
                in ArcMap and other applications.
                -- readme_sbgw_shape.txt - Readme for
                   sbgw_shape
                -- sbgw_shapefiles - Shapefiles
                -- sbgw.style - ArcMap style for
                   symbolizing data
                -- f35109e1.tif - 1:100,000-scale DRG base