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Replacing this with the post from another player. It's much, much better. I've lost the person's name and the boards are wonky, as soon as I can get it again I'll update to give credit where credit is due.
Bixies
Know Your Bixies
Location: It can be found inside of "The Drafling Tower" which is an instanced zone in Rivervale. Once in you will find a room with several non-agro mobs which include "Bixie Scocialite" and "Seamist Guest". After entering this room on the right near the ceiling (there are 3 tiers to the room) are 3 bookshelves. The right bookshelf holds your mastery. Very easy to miss this as the bookshelves are hard to see from bottom of room.
Post-Beta?: Confirmed
Reward: Unknown
Level Requirement: 35?
Centaurs
A History of the Centaur
Location: In the western village (called Thundermist) in Thundering Steppes, in the lower bunk of a bunk-bed next to a female Halfling named Minty Frontbeard.
Post-Beta?: Confirmed.
Reward: Obrel's Gambit (a cutlass).
Level Requirement: 17
Drakota
Drakota (?)
Location: Unknown
Post-Beta?: Unknown
Reaward: Unknown
Level Requirement: Unknown
Elementals
Summoning an Elemental
Location: Academy of Arcane Science in North Freeport, next to the NPC name Scribe Claudia Quarto. Also in the Mage Tower in South Qeynos, though the red teleporter, in the library section on the top stack of books just behind Librarian Dalmas, the NPC standing alone.
Post-Beta?: Confirmed.
Reward: Vhoren's Seed (a short wand with a big orb at the end).
Quote: "All things are but parts arranged. And thus, all things can be changed." - Vhoren, Servant of the Three.
Level Requirement: 25
Evil Eyes
Evil Eye Musings
Location: Runnyeye, in quite deep and hidden next to a forge in some coals.
Post-Beta?: Confirmed.
Reward: Unknown
Level Requirement: Unknown
Fairies
The Precious Fairy Book
Location: Unknown
Post-Beta?: Unknown
Reward: Unknown
Level Requirement: Unknown
Ghosts
The Haunting
Location: In Nektropos Castle on the first floor (dungeon level), in a room where the Manservants spawn on the bookshelf.
Post-Beta?: Confirmed.
Reward: A wand or scepter-like object called Shattersong.
Level Requirement: 25+
Giants
Know Your Giants
Location: Under a bedroll in the Sabertooth Hideout area of Thundering Steppes. The camp is actually called a 'Gnoll Den' and is right next to the secret zone behind the waterfall from Antonica. It is in the northwestern part of what is commonly referred to as the "griffon field," right behind the two scout towers, near a firepit and a named mob, named Resheza, that is orange to 17 and sees through invis. The bag can be selected and inspected without getting close enough to agro the camp if you are careful.
Post-Beta?: Confirmed.
Reward: A spear called Lady Fiana's Gentle Suggestion.
Quote: "You choose not to kneel and so you shal fall!" - Lady Fiana Stonebridge, Knight of Qeynos.
Level Requirement: 17
Goblins
Live Among the Goblins
Location: In Enchanted Lands. In the towers near the zone wall, in a drawer of the eft-most chest of drawers (in a group of three) in the first towers you come upon.
Post-Beta?: Confirmed.
Reward: A dagger named The Tickler.
Quote: "Laugh a little for me, goblin. Giggle as I tickle your spine." - Yora Whisperfoot
Level Requirement: 25
Golems
Known Your Golems
Location: In the book room past the tailors in the deep area of Ruins of Varsoon. A blue book on the short, tilted book shelf in the back of the room.
Post-Beta?: Confirmed.
Reward: A sword called Earthblade.
Quote: "To be alive is to be born, not made." - Aayrn Stormborn
Level Requirement: Unknown
Gnolls
Know Your Gnolls
Location: In a box on the first floor (ground floor) of Gnollslayer Keep, Antonica, to the left of the main entryway as you enter the keep.
Post-Beta?: Confirmed.
Reward: Hogran's Halberd.
Quote: "Yip, yip, thunk." - Brundle Hogran, Guardian of Qeynos.
Level Requirement: 13-15+ to target the box.
Lizardmen
Tales of the Alliz Ew
Location: Unknown
Post-Beta?: Unknown
Reward: Unknown
Level Requirement: Unknown
Nightblood
The Nightblood
Location: Rivervale, east of the docs in the Enchanted lands. Cross the rope bridge that heads up to the mountain (a halfling guard stands at the base of it). Look for the building called "The Loom" (-180, x, -25). The books sits on a shelf on the wall.
Post-Beta?: Confirmed.
Reward: Unknown
Level Requirement: Unknown
Orcs
Orc Society
Location: Behind a shield in the tower in the Commonlands, at the crossroads.
Post-Beta?: Confirmed.
Reward: An unstrung standard bow named Fellfeather.
Quote: "Like leaves tumbling from a seasoned bough, so too shawll my foes fall." - Iria Twintwig
Level Requirement: 15+
Shadowed Men
On the Origins of Shadowed Men
Location: For evil-aligned characters, in North Freeport Academy of Science top floor. For good-aligned characters, take the red teleporter light and follow the stairs until you see a small table with a stack of books and a scroll on it.
Post-Beta?: Confirmed.
Reward: Unknown
Level Requirement: 30+
Sirens
The Siren's Song
Location: In the Enchanted Lands, first hut from docks, within a desk next to a balding halfing in bad armor.
Post-Beta?: Confirmed.
Reward: A fishing poll (?).
Level Requirement: 25
Skeletons
Skeletons
Location: In the library of Stormhold. Coming from the entrance to the library, it's directly behind the bookcase facing you, green book on the floor to the right of the only fallen over bookcase on that side (-117, -31, -150).
Post-Beta?: Confirmed.
Reward: Sir Altan's Strike' (a sledge hammer).
Quote: "It's actually very simple. Stay dead." - Sir Altan the Wandering Knight
Level Requirement: Unknown
Treants
Treants (?)
Location: In a crate in one of the tents on the beach in Nektulos Forest, right near the docks. Specifically, if you're facing the docks, turn left and head up the beach and its the camp farthest at that end. As you arrive at the camp, its in a tent towards the back left (roughly pos 555, pos .17, neg 181).
Post-Beta?: Confirmed
Reward: Unknown
Level Requirement: 20
Zombies
Zatirre's First Zombie
Location: Market 2 in Fallen Gate. Go past the first marketplace and keep left all the way past the pond with Murkwurms, up the hill, till you reach the top room. Then go all the way around to the left until you reach a row of tattered bazaar stalls and some ghostly tier'dals. There is a large orange jar that highlights. As a special note, Fallen Gate requires special access. Both good- and evil-aligned characters can complete the quest, but in either case you must be flagged for Fallen Gate, have someone that is flagged for Fallen Gate get you in, kill Kizdean Gix to get the key (possibly a no-rent item), or (for evil-aligned) obtain access via a quest from Kanos X'Aphon near the entrance to Thieve's Way. If multiple people are doing the FG key quest from N Freeport, be *sure* that everyone hails Kanos, and selects 'Gathering my friends' as their conversation answer. The entrance to Fallen Gate is very near the West Freeport entrance to Thieves Way. Good-aligned characters can use this location to their advantage because of the lack of Freeport city guards (who will kick you out).
Post-Beta?: Confirmed.
Reward: A morning star called D'Vorlian's Lash.
Quote: "The lash is mercy - an Inquisitor's mercy. Bow your head and revel in your luck!" - D'Vorlian of the Dismal Rage
Important notes regarding Mastery Books
If you plan on doing a mastery book, HEED MY ADVICE, young or old or whatever traveler type you are. Once you find the book, then read it to start the quest DO NOT /study any part until after you've obtained the heart, brain and soul items.
Allow me to speak of my tale.
After spending a few days doing the Gnoll quest, having studied everything first and recieving the brain, I began to look for info on it to see what I was doing wrong. Turns out, there is a lurking, nasty bug that can surface (can, not always) that will stop the spirit / heart from dropping - or only dropping obscenely rarely.
What you do is this.
Get the quest.
Find a cluster of mobs that match the type you're after, doesn't matter what. If you're doing this at 20 or a bit lower, there's a 7 spawn "gnoll champion" group in Antonica in the valley leading to the hidden entrance; in the Commonlands there are big clusters of Orc Pawns north of the NFP gate; Zombies.. well. Fallen Gate and Caltoris are filled with them...
Kill these groups until you recieve a note that your journal will be updated when you finish the encounter. Finish the encounter, and.. you should get all three "rewards" to it. Then study any of the tradeable parts to your hearts content, that is all there is to it. I can confirm this working for Orc, Gnoll, Zombie (did Orc and Zombie on the same day) - and I've a guildmate that got stuck in the skeleton quest with what sounds like the same bug.
If you ARE stuck with this bug and want to try it over, not only should you delete the quest, but also delete the book to make sure you completely clear the bug out of your character.
And yes, the zombie reward is buggered right now. Won't sit on anything right.
ADDING:
http://home.comcast.net/~to-ryan/eq2/mastery/
This has detailed walkthroughs on where to find the books themselves.