NOTE FOR THOSE WHO HAVE DOWNLOADED THESE DATA BEFORE FEBRUARY 2005

The pre-February 2005 version of these data was based on Version 6.0
od the Penn World Tables. This version is based on Version 6.1.

Similarly, versions of the paper circulated up to the end of 2004 where
based on PWT6.0. The final, published version is based on PWT6.1