Changes in Version 7.0-0

  o Added pwt7.1 data for PWT 7.1 released July 2012.


Changes in Version 7.0-1

  o Added empty NAMESPACE for R 2.14.0.


Changes in Version 7.0-0

  o Added pwt7.0 data for PWT 7.0 released May 2011.


Changes in Version 6.3-1

  o Use improved compression for data files.


Changes in Version 6.3-0

  o Added pwt6.3 data for PWT 6.3 released August 2009.


Changes in Version 6.2-2

  o Enhanced CITATION file.