id	domain	url
crl-16448	creativecommons.org	http://creativecommons.org/licenses/by-nc/3.0/
crl-16448	www.ala.org	www.ala.org/acrl/sites/ala.org.acrl/files/content
crl-16448	www.educause.edu	www.educause.edu/ero/article/discovering-impact-library-use-andstudent-performance
crl-16448	ftp.iza.org	http://ftp.iza.org
crl-16448	www.leeds.ac.uk	www.leeds.ac.uk/educol/documents/00002182.htm
crl-16448	www.demogr.mpg.de	www.demogr.mpg.de/papers/working/wp-2000-013.pdf