id	domain	url
el-350	www.netgalley.com	https://www.netgalley.com
el-350	www.edweek.org	https://www.edweek.org/dd/articles/2013/02/06/02textbooks.h06.html
el-350	doi.org	https://doi.org/10.1080/01462679.2012.731033
el-350	doi.org	https://doi.org/10.1300/j104v34n04_08
el-350	s3.amazonaws.com	https://s3.amazonaws.com/ecommerceprod.mheducation.com/unitas/school/catalogs/2019/2019-mathematics-catalog.pdf
el-350	doi.org	https://doi.org/10.1080/10691316.2010.487446
el-350	doi.org	https://doi.org/10.1080/10691316.2010.481608