URL	Title	Id
http://digfir-published.macmillanusa.com/astro_interactive_exercise/ie_types_of_close_binary_systems.html	Chapter 1. Types of Close Binary Systems	51413561b11c0fa01a00000b
http://digfir-published.macmillanusa.com/astro_interactive_exercise/ie_types_of_close_binary_systems_dlap.xml	DLAP questions	51413561b11c0fa01a00000b