URL	Title	Id
http://digfir-published.macmillanusa.com/astro_interactive_exercise/ie_a_theoretical_model_of_the_sun.html	Chapter 1. A Theoretical Model of the Sun	513ba1ddb11c0fa65f000001
http://digfir-published.macmillanusa.com/astro_interactive_exercise/ie_a_theoretical_model_of_the_sun_dlap.xml	DLAP questions	513ba1ddb11c0fa65f000001