URL	Title	Id
http://digfir-published.macmillanusa.com/astro_interactive_exercise/ie_part1_types_of_galaxies.html	Chapter 1. Types of Galaxies	5141393cb11c0f181b000005
http://digfir-published.macmillanusa.com/astro_interactive_exercise/ie_part1_types_of_galaxies_dlap.xml	DLAP questions	5141393cb11c0f181b000005