From the back of the book:
For the vigilant gamer or the driven world builder, Living Fantasy drives forward the host of information in the Gygaxian Fantasy Worlds series. Setting designers who master the knowledge with in this tome shall breathe magic into their creation. From vagabond to king, Living Fantasy details the everyday life of those who inhabit the towns , cities, and castles in a fantasy world, and contains supplementary rules for the d20 System.
Sound the note of world creation with Gary Gygax's Living Fantasy!