id	domain	url
crln-22321	www.iop.org	www.iop.org/free2001/
crln-22321	www.bookweb.org	www.bookweb.org/news/btw/4560.html
crln-22321	www.bl.uk	http://www.bl.uk/intormation/pr2001/04.html
crln-22321	www.nara.gov	www.nara.gov