The U.S. Fire Learning Network Field Guide 2010 Addendum contains information on landscapes that have joined the Network since publication of the 2009 Guide (Balsam Mountains, Keystone Appalachians, Nantahala Mountains, New River Headwaters, Northern Blue Ridge Escarpment and Sinlahekin), as well as an updated map of the current FLN, a cumulative map of all FLN landscapes since its inception in 2002 and a list of currently active sites.