This is culled from Jason Zavoda's Encyclopdia Greyhawkiana:
<pre>
Assassins, Guild of (Atirr)[GLD]
DRG#263 Pg# - 51,52
Assassins, Guild of (Cathos City)[GLD]
RKB Pg# - 20
Assassins, Guild of (Chendl)[GLD]
WG8 Pg# - 83
Assassins, Guild of (Garrotten)[GLD]
L2 Pg# - 3,5,6,8,9,10,11,15,16,18,20
Assassins, Guild of (City of Greyhawk)[GLD]
CED Pg# - 119
COG:FFF Pg# - 6,42,43,57,79
COG:GOTF Pg# - 84,88,89,91,93
COH Pg# - 23,144
FTAC Pg# - 8,11,81
GA Pg# - 38-40
LGJ#2 Pg# - 5,6
NA Pg# - 284,289,346,368,394
PGTG Pg# - 29,30,59
SLV Pg# - 11,30
TAB Pg# - 34,40,41,44,57,60,62,63,68,69,73,99,101,116,120,
124,126,127
WGA1 Pg# - 49
WGA2 Pg# - 48
WGA3 Pg# - 56
WGR2 Pg# - 11,12
WOGA Pg# - 25
Assassins, Guild of (Stoink)[GLD]
GA Pg# - 45
Assassins, Guild of (Suderham)[GLD]
A1-4 Pg# - 101
A3 Pg# - 11
Assassins, Guild of (Sulward)[GLD]
WOGG Pg# - 28
Assassins, League of (Dyvers)[GLD]
SLV Pg# - 11,30
Assassins End (City of Greyhawk)[STR]
PGTG Pg# - 33
TAB Pg# - 125,126
WGA1 Pg# - IBC
Assassins Legion (Dorakaa)[GLD]
WGR5 Pg# - 24
WGR6 Pg# - IC
</pre>
and here's the key to the abbreviations:
<pre>
Encyclopedia Greyhawkania Index
A1 Slave Pits of the Undercity (A1)
A1-4 Scourge of the Slavelords (A1-4)
A2 Secret of the Slavers Stockade (A2)
A3 Assault on the Aerie of the Slave Lords (A3)
A4 In The Dungeons of the Slave Lords (A4)
The Adventure Begins (TAB)
The Adventure Begins: Adventure Maps (TAB:AM)
Against The Giants - The Liberation of Geoff - Adventure (ATG)
Artifact of Evil (AOE)
Bigbys Curse (BC)
C1 The Hidden Shrine of Tamoachan (C1)
C2 Ghost Tower of Inverness (C2)
Castles: Hart (HART)
City of Greyhawk: Adventure Cards (COG:C#)
City of Greyhawk: Folks, Feuds and Factions (COG:FFF)
City of Greyhawk: Gem of the Flanaess (COG:GOTF)
City of Hawks (COH)
Come Endless Darkness (CED)
The Crypt of Lyzandred the Mad (COLTM)
D1 Descent into the Depths of the Earth (D1)
D2 Shrine of the Kuo-Toa (D2)
D3 Vault of the Drow (D3)
D1-2 Descent into the Depths of the Earth (D1-2)
Dance of Demons (DOD)
The Doomgrinder (TD)
Dragon Magazine (DRG#)(1,2,3,5,6,7,9,19,37,43,52,55,56,57,59
,63,64,65,67,68,69,70,71,82,86,87,88,89,90,92,93,100
,131,139,164,167,171,173,178,185,188,189,191,194,195
,196,200,204,206,208,209,210,211,212,219,225,230,233
,236,238,241,242,243,245,246,249,253,256,258,262,263
,264,265,268,269,270,271,274,276,277,278,
284,285,287,288,290,291,292,AN1)
Dungeon Magazine (DUN#)(6,13,19,30,32,41,42,53,70,71,73,77)
Dungeon Masters Guide 1st Edition (DMG1)
Eldritch Wizardry (EW)
The Fright At Tristor (FAT)
From the Ashes: Atlas of the Flanaess (FTAA)
From the Ashes: Campaign Book (FTAC)
From the Ashes: References Card (FTAR#)(1-14)
G123 Against the Giants (G123)
GDQ1-7 Queen of the Spiders (GDQ)
Ghost Tower of Inverness (GTOI)
Greyhawk Adventures (GA)
Greyhawk Wars: Rule Book (GW:RB)
Greyhawk Wars: Adventures (GW:ADV)
I1 Dwellers of the Forbidden City (I1)
I7 Baltrons Beacon (I7)
I9 Day of Al'Akbar (I9)
IQ3 Warriors of the Gray Queen (IQ3)
Ivid the Undying (IVID)
L1 The Secret of Bone Hill (L1)
L2 The Assassins Knot (L2)
L3 Deep Dwarven Delve (L3)
Living Greyhawk Gazetteer (LGG)
Living Greyhawk Journal (LGJ#)(0,1,2,3,4)
Lost Tomaochan: The Hidden Shrine of Lubaatum (LT)
Monster Manual (MMI)
Monster Manual II (MMII)
N1 Against the Cult of the Reptile God (N1)
Night Arrant (NA)
Players Guide to Greyhawk (PGTG)
Polyhedron Magazine (POLY#)(92,101,128,129)
The Return of the Eight (ROT8)
Return to the Keep on the Borderland (RKB)
Return to the Temple of Elemental Evil (RT1-4)
Return to the Tomb of Horrors (RTOH)
Return to White Plume Mountain (RWPM)
Rogues Gallery (ROG)
S1 Tomb of Horrors (S1)
S2 White Plume Mountain (S2)
S3 Expedition To The Barrier Peaks (S3)
S4 The Lost Caverns of Tsojcanth Book One (S4B1)
S4 The Lost Caverns of Tsojcanth Book Two (S4B2)
Saga of Old City (SOOC)
Sagard the Barbarian #1 The Ice Dragon (SAG1)
The Scarlet Brotherhood (TSB)
Sea of Death (SOD)
Shattered Circle (SC)
Siege of the Citadel (SOTT)
Slavers (SLV)
The Star Cairns (TSC)
T1-4 Temple of Elemental Evil (T1-4)
TSR Jam 1999 (JAM)
U1 The Sinister Secret of Saltmarsh (U1)
U2 Danger at Dunwater (U2)
U3 The Final Enemy (U3)
UK1 Beyond the Crystal Cave (UK1)
UK2 Sentinel (UK2)
UK3 Gauntlet (UK3)
Unearthed Arcan (UA)
Vecna Reborn (VR)
WG4 The Forgotten Temple of Tharizdun (WG4)
WG5 Mordenkainens Fantastic Adventure (WG5)
WG6 Isle of the Ape (WG6)
WG8 Fate of Istus (WG8)
WG10 Childs Play (WG10)
WG11 Puppets (WG11)
WG12 Vale of the Mage (WG12)
WGA1 Falcons Revenge (WGA1)
WGA2 Falconmaster (WGA2)
WGA3 Flames of the Falcon (WGA3)
WGA4 Vecna Lives! (WGA4)
WGM1 Borderwatch (WGM1)
WGQ1 Patriots of Ulek (WGQ1)
WGR1 Greyhawk Ruins (WGR1)
WGR2 Treasures of Greyhawk (WGR2)
WGR3 Rary the Traitor (WGR3)
WGR4 The Marklands (WGR4)
WGR5 Iuz the Evil (WGR5)
WGR6 City of Skulls (WGR6)
WGS1 The Five Shall Be One (WGS1)
WGS2 Howl From the North (WGS2)
World of Greyhawk Boxed Set: A guide to (WOGA)
World of Greyhawk Boxed Set: Glossography (WOGG)
</pre>
If you have questions about the list, I would contact Jason directly:
nemesis@magpage.com.