Here are the Treasure Classes 33-60. Items with a qlvl of 31-33 belong to Treasure Class 33, items with a qlvl of 34-36 belong to Treasure Class 36, etc.

The relative frequency that an item drops is:

6 for most weapons
4 for claw weapons
3 for most armor
2 for wands, staves, scepters, and class-specific weapons
1 for class-specific armor

The odds that an item will be dropped when there is a drop from a Treasure Class is that item's frequency divided by the sum of frequencies of all the items in the Treasure Class.

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Treasure Class 33

Item	Odds	Unique	Set
Barbed Club (qlvl 31)	6/90	Fleshrender (qlvl 46)	None
Battle Dart (qlvl 31)	6/90	Deathbit (qlvl 52)	none
Burnt Wand (qlvl 31)	2/90	Suicide Branch (qlvl 41)	none
Demonhide Gloves (qlvl 33)	3/90	Venom Grip (qlvl 37)	none
Glowing Orb Sorc-only (qlvl 32)	2/90	none	none
Gothic Plate (qlvl 32)	3/90	Rattlecage (qlvl 39)	Sigon's Shelter (qlvl 9)
Great Maul (qlvl 32)	6/90	Steeldriver (qlvl 39)	none
Great Sword (qlvl 33)	6/90	The Patriarch (qlvl 39)	none
Hatchet (qlvl 31)	6/90	Coldkill (qlvl 44)	none
Jawbone Visor Barb-only (qlvl 33)	1/90	none	none
Lochaber Axe (qlvl 33)	6/90	The Meat Scraper (qlvl 49)	none
Long War Bow (qlvl 31)	6/90	Blastbark (qlvl 38)	none
Mummified Trophy Necro-only (qlvl 33)	1/90	none	none
Poignard (qlvl 31)	6/90	Spineripper (qlvl 40)	none
Rancid Gas Potion (qlvl 32)	6/90	none	none
Razor Bow (qlvl 33)	6/90	Riphook (qlvl 39)	none
Repeating Crossbow (qlvl 33)	6/90	Doomslinger (qlvl 38)	none
Rune Scepter (qlvl 31)	2/90	Zakarum's Hand (qlvl 45)	none
War Spear(qlvl 33)	6/90	The Impaler (qlvl 39)	none
Wrist Spike Asn-only (qlvl 32)	4/90	none	none

Treasure Class 36

Item	Odds	Unique	Set
Akaran Targe Pal-only (qlvl 35)	1/97	none	none
Alpha Helm Druid-only (qlvl 35)	1/97	none	none
Arbalest (qlvl 34)	6/97	Langer Briser (qlvl 40)	none
Cedar Bow (qlvl 35)	6/97	Kuko Shakaku (qlvl 41)	none
Ceremonial Javelin Ama-only (qlvl 35)	2/97	Titan's Revenge (qlvl 50)	none
Cleaver (qlvl 34)	6/97	The Butcher's Pupil (qlvl 47)	none
Defender (qlvl 34)	3/97	Viscerataunt (qlvl 36)	none
Demonhide Boots (qlvl 36)	3/97	Infernostride (qlvl 37)	Rite of Passage (qlvl 39)
Demonhide Sash (qlvl 36)	3/97	String of Ears (qlvl 37)	none
Fascia Asn-only (qlvl 36)	4/97	none	none
Flanged Mace (qlvl 35)	6/97	Sureshrill Frost (qlvl 47)	none
Francisca (qlvl 34)	6/97	The Scalper (qlvl 65)	none
Fuscina (qlvl 36)	6/97	Kelpie Snare (qlvl 41)	none
Ghost Armor (qlvl 34)	3/97	The Spirit Shroud (qlvl 36)	none
Light Plate (qlvl 35)	3/97	Heavenly Garb(qlvl 39)	Arcanna's Flesh (qlvl 20)
Military Axe (qlvl 34)	6/97	Warlord's Trust (qlvl 43)	none
Partizan (qlvl 35)	6/97	Pierre Tombale Couant (qlvl 51)	none
Quarterstaff (qlvl 35)	2/97	Ribcracker (qlvl 39)	none
Rondel (qlvl 36)	6/97	Heart Carver (qlvl 44)	none
Serpentskin Armor (qlvl 36)	3/97	Skin of the Vipermagi (qlvl 37)	none
Shamshir (qlvl 35)	6/97	Hexfire (qlvl 41)	none
War Hat (qlvl 34)	3/97	Peasant Crown (qlvl 36)	Cow King's Horns (qlvl 20)
War Scythe (qlvl 34)	6/97	The Grim Reaper (qlvl 39)	none

Treasure Class 39

Item	Odds	Unique	Set
Ashwood Bow Ama-only (qlvl 39)	2/91	none	none
Bearded Axe (qlvl 38)	6/91	Spellsteel (qlvl 47)	none
Bill (qlvl 37)	6/91	Blackleech Blade (qlvl 50)	Hwanin's Justice (qlvl 28)
Cedar Staff (qlvl 38)	2/91	Chromatic Ire (qlvl 43)	none
Crystalline Globe Sorc-only (qlvl 37)	2/91	none	none
Demonhide Armor (qlvl 39)	3/91	Skin of the Flayed One (qlvl 39)	none
Dimensional Blade (qlvl 37)	6/91	Ginther's Rift (qlvl 45)	none
Double Bow (qlvl 39)	6/91	Endlesshail (qlvl 44)	none
Espandon (qlvl 37)	6/91	Crainte Vomir (qlvl 50)	none
Fetish Trophy Necro-only (qlvl 39)	1/91	none	none
Full Plate (qlvl 37)	3/91	Goldskin (qlvl 38)	Tancred's Spine (qlvl 27)
Great Pilum (qlvl 37)	6/91	none	none
Jagged Star (qlvl 39)	6/91	Moonfall (qlvl 50)	Aldur's Rhythm (qlvl 29)
Lion Helm Barb-only (qlvl 38)	1/91	none	none
Petrified Wand (qlvl 38)	2/91	Cairn Shard (qlvl 43)	none
Round Shield (qlvl 37)	3/91	Moser's Blessed Circle (qlvl 39)	Whitstan's Guard (qlvl 41)
Sallet (qlvl 37)	3/91	Rockstopper (qlvl 39)	none
Sharkskin Belt (qlvl 39)	3/91	Razortail (qlvl 39)	M'avina's Tenet (qlvl 21)
Sharkskin Boots (qlvl 39)	3/91	Waterwalk (qlvl 40)	none
Sharkskin Gloves (qlvl 39)	3/91	Gravepalm (qlvl 39)	Magnus' Skin (qlvl 41)
Tulwar (qlvl 37)	6/91	Blade of Ali Baba (qlvl 43)	none
Twin Axe (qlvl 39)	6/91	Islestrike (qlvl 51)	none
War Dart (qlvl 39)	6/91	none	none

Treasure Class 42

Item	Odds	Unique	Set
Akaran Rondache Pal-only (qlvl 40)	1/84	none	none
Ancient Armor (qlvl 40)	3/84	Silks of the Victor (qlvl 38)	Milabrega's Robe (qlvl 23)
Barbed Shield (qlvl 42)	3/84	Lance Guard (qlvl 43)	none
Battle Scythe (qlvl 40)	6/84	Athena's Wrath (qlvl 50)	none
Battle Sword (qlvl 40)	6/84	Headstriker (qlvl 47)	none
Casque (qlvl 42)	3/84	Stealskull (qlvl 43)	none
Cinquedeas (qlvl 42)	6/84	Blackbog's Sharp (qlvl 46)	none
Cloudy Sphere Sorc-only (qlvl 41)	2/84	none	none
Dacian Falx (qlvl 42)	6/84	Bing Sz Wang (qlvl 51)	none
Gothic Staff (qlvl 42)	2/84	Warpspear (qlvl 47)	none
Griffon Headdress Druid-only (qlvl 40)	1/84	none	none
Hand Scythe Asn-only (qlvl 41)	4/84	none	none
Holy Water Sprinkler (qlvl 40)	2/84	The Fetid Sprinkler (qlvl 46)	none
Hurlbat (qlvl 41)	6/84	none	none
Linked Mail (qlvl 42)	3/84	Spirit Forge (qlvl 43)	none
Scutum (qlvl 43)	3/84	Stormchaser (qlvl 40)	none
Siege Crossbow (qlvl 40)	6/84	Pus Spitter (qlvl 44)	none
Simbilan (qlvl 40)	6/84	none	none
Tabar (qlvl 42)	6/84	Stormrider (qlvl 49)	none
Trellised Armor (qlvl 40)	3/84	Ironpelt (qlvl 41)	none
War Fork (qlvl 41)	6/84	Soulfeast Tine (qlvl 43)	none

Treasure Class 45

Item	Odds	Unique	Set