From the back of the book
Within this booklet you will find a wide variety of dungeon maps that are suitable for use with most fantasy role-playing games and settings. The maps themselves are ideal for Game Masters who do not have the time/inclination to create their own - and are ready to be populated with a multitude of deadly traps and fearsome monsters.
So, whether you are creating a scenario that features the long abandoned halls of a lost civilisation, the labyrinthine lair of a half-mad archmage, or even the haunted tombs of a powerful necromancer, The Little Book of Dungeons has probably a suitable map to help you get the adventure started.
According to the inside cover, the book is a print version of maps featured in the PDF items The Little Book Of Dungeons Volume IV, The Little Book Of Dungeons Volume V, and The Little Book Of Dungeons Volume VI.