GPO Access Content Migration
GPO Access is in the process of moving information into a new database: Federal Digital System (FDsys). Some collections are no longer available in GPO Access, one is available in both and the rest are set to be moved into FDsys by the end of 2009.
According to the GPO FDsys “is an advanced digital system that will enable GPO to manage Government information from all three branches of the U.S. Government.”
For a complete list of collections that have made the move to FDsys (and are no longer findable in GPO Access) see: http://www.gpo.gov/fdsys/search/home.action