The Dungeon Masters Guide 1st edition was the original Dungeon Master's Guide for the AD&D game, authored by Gary Gygax and first published in August 1979. Note that unlike other publications from future editions which were entitled "Dungeon Master's Guide" (such as Dungeon Master's Guide 3rd edition or Dungeon Master's Guide 3.5), this book's title lacks the apostrophe.
The Dungeon Masters Guide 1st edition covered the essential game rules for the Dungeon Master: creating and managing both player characters and non-player characters, directing combat, and handling adventures and campaigns that last multiple sessions. The book also included game statistics for magic items and treasure, details how to use random monster encounters, and provides statistics for some of the basic monsters and creatures of the game. New magic items were introduced. It contains scores of tables and charts for figuring damage and resolving encounters in a typical adventure, tables and rules for creating characters, and lists of the various abilities of the different classes of characters.
This copy is in Good condition. There is some coloring and spotting of the page edges. A plastic cover has been applied for protection. The orange spine has faded. There is some shelf wear. As always, the photos are of the book you will receive.