These files are the documentation from the BLS or Census for the
March CPS files (the Annual Demographic Files) that were used
to create the Mare-Winship uniform extracts. They may be used
to enhance ones understanding of the extracts, but the MWX.DOC
file should have what is needed to use the extracts. 

mwwgt.sas is a program to print out the number of records each
year with each weight variable, and the sum of the weights each
year for each weight variable. The resulting listing (mwwgt.lst)
is quite informative.

feenberg@nber.org