Integrated Public Use Microsamples
from the University of Minnesota

www.ipums.org was the source, and they have 
an excellent variable extraction system 

nberage1% ls -l
total 12
drwxrwxr-x   6 SCCS     web         1024 Feb 28 17:42 data
drwxrwxr-x   3 SCCS     web          512 Feb 22 15:52 datadef_spss
-rw-rw-r--   1 SCCS     web          145 Mar  1 17:06 readme.txt
drwxrwxr-x   3 jroth    web          512 Mar  1 17:02 sas
drwxrwxr-x   2 jroth    web         1024 Mar  1 17:05 stata
drwxrwxr-x   7 SCCS     web          512 Jul 23  1998 user_guide
nberage1% 

Jean Roth, jroth@nber.org, 3/1/02