If you participate in Pern fandom, this book is very valuable. It includes scaled drawings of many places on Pern, from the original colonists' time through "The White Dragon". Land use, climate, population, and spatial maps are also included. The only frustrating thing is that this is not a complete work - if the place hasn't been mentioned and described in detail in the Harper Hall trilogy, "Moreta" , or the original trilogy, then it's not mapped in this book. Igen Weyr, Telgar Weyr, High Reaches Hold, and Benden Hold are missing, to name a few. But Fonstadt has produced an excellent reference work.