URL	Title	Id
http://digfir-published.macmillanusa.com/astro_interactive_exercise/ie_hertzsprung-russel_diagrams.html	Chapter 1. Hertzsprung-Russell Diagrams	51406ccbb11c0fc20c000000
http://digfir-published.macmillanusa.com/astro_interactive_exercise/ie_hertzsprung-russel_diagrams_dlap.xml	DLAP questions	51406ccbb11c0fc20c000000