From the front cover:
"An illustrated compendium of monsters: Aerial Servant to Zombie"
From the back cover:
"OVER 350 MONSTERS
This book provides a complete alphabetical listing of all 'monsters' encountered in the various works which comprise the Advanced Dungeons & Dragons game system. It is an invaluable aid to players and dungeon masters alike!
For example:
QUASIT
FREQUENCY: Very rare
DAMAGE/ATTACK: See below
NUMBER APPEARING: 1
SPECIAL ATTACKS: See below
ARMOR CLASS: 2
SPECIAL DEFENSES: See below
MOVE: 15"
MAGIC RESISTANCE: Standard
HIT DICE: 5
INTELLIGENCE: Low
% IN LAIR: 0%
ALIGNMENT: Chaotic Evil
TREASURE TYPE: Q (X3)
SIZE: S (2' tall)
NO. OF ATTACKS: 1
The quasit is the unchanged form of the familiar of a chaotic evil magic-user or cleric. As such it is very rarely encountered except in the planes of the abyss or upon the death of its master or ..."