These seem to me to be the common items:
A2 -Secret of the Slaver's Stockade (spine damage and 1 ripped corner on module page)
A3 - Assault on the Aerie of the Slave Lords
A4 - In the Dungeons of the Slave Lords
B2 - Keep on the Borderlands (module dust cover is split @ spine)
B3 - Palace of the Silver Princess
B4 - The Lost City
C1 - The Hidden Shrine of Tamoachan
C2 - The Ghost Tower of Inverness
CA2 - Swords of Deceit (a Lankhmar Module)
CM1 - Test of the Warlords
CM2 - Death's Ride
CM3 - Sabre River
D1-2 - Descent into the Depths of the Earth
D3 - Vaultof the Drow
EX1 - Dungeonland
FR3 - Empires of the Sands
G1-2-3 - Against the Giants
I1 - Dwellers of the Forbidden City
I2 - Tomb of the Lizard King
I4 - Oasis of the White Palm
I5 - The Lost Tomb of Martek
IM1 - The Immortal Storm
IM2 - The Wrath of Olympus
M2 - Vengeance of Alphaks
N2 - The Forest Oracle
N4 - Treasure Hunt
O1 - The Gem and the Staff
Q1 - Queen of the Demonweb Pits
S1 - Tomb of Horrors
S2 - White Plume Mountain
S3 - Expedition to the Barrier Peaks
S4 - The Lost Caverns of Tsojcanth (some spine wear and cover wearing)
T1 -The Village of Hommlet
U1 - The Sinister Secret of Saltmarsh
UK1 - Beyond the Crystal Cave
UK3 - The Gauntlet
X1 - The Isle of Dread (significant spine wear)
X2 - Castle Amber
X3 - Curse of Xanathon
X4 - Master of the Desert Nomads
X6 - Quagmire!
X7 - The War Rafts of Kron
XL1 - Quest for the Hearthstone
The DragonLance Series:
DL1 - Dragons of Despair
DL2 - Dragons of Flame
DL3 - Dragons ofHope
DL4 - Dragons of Desolation
DL5 - Dragons of Mystery
DL6 - Dragons of Ice
DL7 - Dragons of Light
DL8 - Dragons of War
The Complete Priest's Handbook printed 1990
The Rogues Gallery printed 1980
Monstrous Compendium - Greyhawk Adventures Appendix printed 1990
Dungeon Geomorphs printed 1980
AC9 - Creature Catalogue printed 1986
REF4 - The Book of Lairs II printed 1987
Dungeons and Dragons Basic Rulebook printed 1981
Dungeons and Dragons Expert Rulebook printed 1981
Dungeons and Dragons Players Manual printed 1983
Dungeons and Dragons Dungeon Masters Rulebook printed 1983
Dungeons and Dragons Players Companion printed 1984
Dungeons and Dragons Dungeon Masters Companion printed 1984
The Dungeon Master's Guide printed 1979
Monster Manual II printed 1983
Player's Handbook printed 1989
Deities and Demigods printed 1980
Monster Manual printed 1977
These are the uncommon:
CM5- Mystery of the Snow Pearls
CM6 - Where Chaos Reigns
CM8 - The Endless Stair
DA2 - Temple of the Frog
DA3 - City of the Gods
H2 - The Mines of Bloodstone
H3 - The Bloodstone Wars
I7 - Baltron's Beacon
I11 - Needle
X12 - Skarda's Mirror
X13 - Crown of Ancient Glory
Softbound Modules:
I3-5 - Desert of Desolation
T1-4 - The Temple of Elemental Evil
WG7 - Castle Greyhawk
Box Sets:
Kara-tur (like new, opened once, never played all maps, modules etc are glossy!)
The seller says that everything is in great condition. If so you could make more out of both common and uncommon items, but this seems like a workhorse of a collection rather than something you could turnover easily for $600 or so