For reference, here is the Table of Content that was posted by Richard Baker:
Introduction
How To Use This Book in Your Campaign
What You Need to Play
Chapter 1: Races of the Underdark
Chitine
Deep Imaskari
Drow
Duergar
Gloaming
Grimlock
Kuo-toa
Slyth
Svirfneblin
Other Character Races
Age, Height, and Weight
Chapt 2: Regions and Feats
Character Regions
Chitine
Deep Imaskari
Gloaming
Grimlock
Kuo-toa
Slyth
Character Feats
Axeshield
Bowslinger
Caustic Adaptation
Caver
Elfhunter
Enhanced Adhesive
Exotic Armor Proficiency
Extra Wild Shape
Familiar Spell
Graft Illithid Flesh
Highborn Drow
Improved Familiar
Improved Levitation
Lolth's Meat
Metanode Spell
Node Defense
Node Spellcasting
Node Store
Node Sensitive
Portal Sensitive
Stone Soul
Strong Mind
Tunnelfighter
Tunnelrunner
Underdark Immigrant
Wisdom Breeds Caution
Chapter 3: Prestige Classes
Arachnemancer
Cavelord
Deep Diviner
Drow Judicator
Illithid Body Tamer
Imaskari Vengeance Taker
Inquisitor of the Drowning Goddess
Prime Underdark Guide
Sea Mother Whip
Shadowcrafter
Vermin Keeper
Yathchol Webrider
Chapter 4: Magic and Spells of the Underdark
Lore of the Underdark
Node Magic
Portals
New Domains
Balance Domain
Portal Domain
Watery Death Prestige Domain
New Spells
Amorphous Form
Blindsight
Burrow
Burrow, Mass
Caltrops
Camouflage
Changestones
Clarity of Mind
Contagious Fog
Darkvision, Mass
Deeper Darkvision
Dehydrate
Drown
Drown, Mass
Earth Lock
Earth Shield
Eradicate Earth
Excavate
Hail of Stone
Locate Node
Mark of the Outcast
Mineralize Warrior
Node Door
Node Genesis
Node Lock
Portal Barricade
Portal Stabilization
Portal to Portal Redirect
Portal Reformat
Portal View
Reflective Disguise
Reflective Disguise, Mass
Rushing Waters
Sanctuary, Mass
Spiderskin
Stick
Stone Metamorphosis
Stone Metamorphosis, Greater
Stoneskin, Improved
Stone Shape, Greater
Stone Sphere
Tremorsense
Tunnel Swallow
Undermaster
Viscid Glob
Wall of Dispel Magic
Wall of Greater Dispel Magic
Weighed in the Balance
Word of Balance
Chapter 5: Equipment and Magic Items
Adventuring Gear
Weapons
Armor
Other Equipment
Poison
Magic Items
Illithid Grafts
Chapter 6: Monsters of the Underdark
All-Consuming Hunger
Annihilator
Arachnoid Mouther (arachnoid creature template)
Baphitaur
Chameleon Bugbear (chameleon creature template)
Earth Glider
Elder Brain
Faerzress-infused Minotaur (faerzress infused creature template)
Giant Cockroach
Giant Maggot
Ineffable Horror
Kuo-toa Leviathan
Lith
Lurker
Maur (Hunched Giant)
Mindwitness (half-illithid creature template)
Phaerlock
Portal Drake
Stone Flyer
Stony Devil (mineral warrior template)
Gloura
Chapter 7: Exploring the Underdark
Geology and Environmnets of the Underdark
Rocks and Rock Formations
The Underdark Environment
Climate
Ecology
Spelunking
Cramped Spaces
Climbing
Access
Underdark Encounter Tables
Encounter Chance
How to Use the Tables
Uppderdark (Underground, Frontier)
Upperdark Wilds (Underground, Wilderness)
Middledark (Undergaround, Settled)
Middledark Wilds (Underground, Frontier)
Lowerdark (Underground, Wilderness)
Lowerdark Wilds (Underground, Desolate)
An Underdark Primer
Chapter 8: Geography of the Underdark
Underdark Domains
[[Lots of entries, beginning with Ammarindar and ending with Yathchol. This chapter is about 80 pages or so.]]
Chapter 9: Adventures in the Underdark
Dungeons in the Underdark
Adventure Sites
Drowned Multum
Gduar's Garden
Shape of Water
Race Chart 1:
I'm guessing: Chitine, Imaskar, and drow.
Race Chart 2:
Still guessing: Duergar, Grimlock, Gloaming (?), Kuo-toa
Race Chart 3
Last guess: Svirfneblin, Slyth (?), Derro.
I've no idea what are gloamings and slyths, so I've associated the names with the two creatures I havn't recognized. Could be wrong in the association, tough.