id	domain	url
dialog-409	nces.ed.gov	http://nces.ed.gov/nationsreportcard/pdf/dst2009/2010459.pdf
dialog-409	nces.ed.gov	http://nces.ed.gov/nationsreportcard/pdf/dst2009/2010459.pdf
dialog-409	repository.upenn.edu	http://repository.upenn.edu/dissertations/aai3246236