Hi, Diviny,

You may read "the purpose of the book" in the preface and "the user guide". I think you could find what you require. I copy some details of which you are intesting as following,

"Because we expect students to obtain and analyze data, we include detailed
instructions on how to access a variety of data sets online. For example, the
CPS.doc file (in the Basic Tools\InternetData folder) explains exactly how a
student can extract data from the Current Population Survey (CPS) available
at <ferret.bls.census.gov>. In addition, we include practical explanations of
how to recode variables and construct an hourly wage variable. The CPS is an
outstanding source and has provided the raw data for many excellent student
papers."

"www.wabash.edu/econometrics"

Best Regards