These files are available as 51 separate files from

www.ipums.org/usa/samples.html

ftp://ftp.ipums.org/ipums/data/1980_5pct/

IPUMS updated the 1980 files 2002-09-27
there were duplicate SERIAL values as described in
/home/data/IPUMS-98/readme_1980_5pct.txt
The old data is available in old_data 

Jean Roth, jroth@nber.org, 2002-12-04