URL	Title	Id
http://digfir-published.macmillanusa.com/astro_interactive_exercise/ie_the_asteroid_belt.html	Chapter 1. The Asteroid Belt	513ab531b11c0f605b00000f
http://digfir-published.macmillanusa.com/astro_interactive_exercise/ie_the_asteroid_belt_dlap.xml	DLAP questions	513ab531b11c0f605b00000f