id	domain	url
aeer-224	www.bartleby.com	http://www.bartleby.com/65/sk/skiing.html
aeer-224	encarta.msn.com	http://encarta.msn.com
aeer-224	encarta.msn.com	http://encarta.msn.com/encyclopedia_76157434
aeer-224	www.britannica.com	http://www.britannica.com/eb/article?tocid=900
aeer-224	www.britannica.com	http://www.britannica.com/eb/article?tocid=937
aeer-224	en.wikipedia.org	http://en.wikipedia.org/wiki/alpine_skiing
aeer-224	en.wikipedia.org	http://en.wikipedia.org/wiki/history_of_skiing