From the back of the book:
Four Exciting Dungeon Crawl Classics Adventures & More!
The Sullenlands Adventure Omnibus and Guide combines all of Mark Bishop’s best-selling adventures (Nebin Pendlebrook's Perilous Pantry, The Frost Fang Expedition, and The Crypt in Cadaver Canyon) into a single massive tome! The adventures are enhanced with over 150 pages of new material, including world details of the mysterious Sullenlands, a new patron, a dwarven cleric class, a new mini-adventure (The Bellows of Bromforge), new monsters, magic items, random encounters, random tables, and much more!
A new world of danger and wonder awaits!
User summary:
The source book is published as two PDF documents:
310-page, Digest, scenario
17-page, US Letter, "Appendix" - print-and-play components