From publisher blurb:
Customize you dungeons!
Adventures and Maps set under the earth for old school fantasy role playing games (OSR games). Over 140 pages of maps and adventures featuring the unique mapping style of Dyson Logos.
Five full adventures fill out the beginning of the book, followed by 44 additional dungeon maps each with a page for the GM to key and make notes about each dungeon.
This edition is identical to the 2012 & 2013 editions of Dyson's Delves volume 1, sporting a revised cover design.
This softcover edition uses cream paper within, while the hardcover edition uses white paper.