While we are getting more and more questions with references to “CBA’s”, Social Studies was not one of the specific areas that our Reference Services Committee identified as an area for eresource collection development in 2010. That being said, please feel free to explore these trials set up by the Washington State Library and, please, share your feedback!
http://www.sos.wa.gov/library/libraries/projects/sdl/DBTrials2010.aspx