From the back of the book:
"Explore a World of Epic Adventure!
Requires the use of the Dungeons & Dragons Player's Handbook, Third Edition, published by Wizards of the Coast.
This book contains everything needed by players and DMs to weave epic tales of heroism in the World of Erde. A detailed history of the world, descriptions of the lands, maps, heraldry, races, languages, deities, classes, spells, magic items, and monsters are found within, and all are fully compatible with the 3rd Edition of the world's most popular fantasy roleplaying game.
Also includes a mini-adventure by Gary Gygax!"