id	domain	url
iassist-68	www.hist.umn.edu	http://www.hist.umn.edu-/~ipums/extract.html
iassist-68	www.census.gov	http://www.census.gov/ftp/pub/des/www/welcome.html
iassist-68	www.calgary.ca	http://www.calgary.ca/~libdata/anlrud.html