id	domain	url
concept-329	www.bbc.co.uk	http://www.bbc.co.uk/history/ancient/romans/thirdcenturycrisis_article_01.shtml
concept-329	www.bbc.co.uk	http://www.bbc.co.uk/history/ancient/romans/thirdcenturycrisis_article_01.shtml
concept-329	www.gutenberg.org	http://www.gutenberg.org/ebooks/13144