Manual of the Planes, hardback rulebook for AD&D 1st edition, by Jeff Grubb
“…from Arcadia to Pandemonium, from the plane of elemental Fire to the Astral plane, vast new worlds of adventure are now open to players.
A vital source book for players and DMs of all levels of experience, the Manual of the Planes details the manifold worlds of the known planes of existence. This book describes the inhabitants, rulers, and environments of these worlds, as well as rules for movement, survival, combat, and spell use in these alien surroundings. A different style of AD&D adventures awaits!”