URL	Title	Id
http://digfir-published.macmillanusa.com/astro_interactive_exercise/ie_moons_tidal_recession.html	Chapter 1. Moon's Tidal Recession	513a9e63b11c0fe05a000000
http://digfir-published.macmillanusa.com/astro_interactive_exercise/ie_moons_tidal_recession_dlap.xml	DLAP questions	513a9e63b11c0fe05a000000