Skill Books

There are five books that will advance each of your skills, except that there are six for four of the schools of magic and four for Speechcraft - if there is a fifth, someone please let me know the title and location. Here's a list of the books associated with each skill and where they are located. This list does not include books showing up as levelled loot, but it does include titles that may be given as quest rewards. Unless otherwise noted, these books are not in containers. They are out in the open in bookshelves, laying on tables or desks, or whatever.

Skill Title Locations
Acrobatics
Thief
S'Krivva's house in Bravil
A Dance in Fire, vol. 1
Ganredhel's house in Cheydinhal
A Dance in Fire, vol. 4
Kvatch Caste
The Black Arrow, vol. 1
Torbald the Sufficient's House (chest)
Mystery of Talara, vol. 1
May show up as leveled loot
Alchemy
A Game at Dinner
Chorral Mages Guild
Mannimarco: King of Worms
Arcane University: Mystic Archives
Song of the Alchemists
Arcane University: Lustratorium
De Rerum Dirennis
All Things Alchemical (Skingrad)
Calcinator Treatise
Imperial Bridge Inn
Alteration
Daughter of the Niben
Skingrad Mages Guild Living Quarters
The Dragon Break
Elven Gardens District: Dovyn Aren's House (Upstairs)
Sithis
Leyawiin Chapel
Reality and Other Falsehoods
Southern Books, 2nd Floor
The Lunar Lorkhan

Henantier's Dream (only accessible in "Through a Nightmare Darkly")
May show up as leveled loot (?)

Armorer
The Armorer's Challenge

Cheydinhal Fighters Guild
Phintias (First Edition Books) has one in his personal inventory

Last Scabbared of Akrash
Market District: A Fighting Chance, Upstairs
Light Armor Repair
Bravil Castle: Barracks
Cherim's Heart of Anequina
Market District: First Edition, Upstairs
Heavy Armor Repair
May show up as leveled loot
Athletics
The Ransom of Zarek
Arena Bloodworks (cupboard)
A Dance in Fire, vol. 3
Juras the Shepherd's House (Skingrad)
The Red Kitchen Reader
Anvil Castle: Private Quarters
Beggar
Cloud Ruler Temple, Great Hall
The Argonian Account, Book 1

May show up as leveled loot

Blade
Words and Philosophy
Modryn Oreyn's House (Chorral)
2920, Morning Star
Castle Cheydinhal, Private Quarters
Castle Leyawiin, Steward's quarters
Reward for "The Wandering Scholar" quest (Fighter's Guild)
Fire and Darkness
Chest in the Imperial Sewers during "The Ultimate Heist" quest
Song of Hrormir
Castle Bravil, Private Quarters, East Wing
Arena District (chest near sleeping pallets)
Battle of Sancre Tor
Castle Bravil, Great Hall
May show up as leveled loot
Block
Death Blow of Abernanit
Anvil Fighters Guild, Dining Hall (chest)
The Mirror
Leyawiin City Watch Barracks
A Dance in Fire, vol. 2
Elven Gardens Guardhouse
Warrior
Castle Leyawiin, Private Quarters
The Warp in the West
Cloud Ruler Temple, Great Hall
Brother Piner (gives it to you if you ask for assistance in Main Quest)
May show up as leveled loot
Blunt
The Legendary Sancre Tor
Chorral: Vilena Donton's House, Vilena Donton's Quarters
The Importance of Where
Castle Bravil, Dungeon
Night Falls on Sentinel
Goblin Jim's Cave
King
Anvil Castle: Royal Quarters
Mace Etiquette
May show up as leveled loot
Conjuration
The Doors of Oblivion
Fort Caractacus (exterior area)
Anvil Mages Guild, Library
Cloud Ruler Temple, Great Hall
Liminal Bridges
Arcane University, Mystic Archives, Upstairs
2920, Hearth Fire
Bruma Chapel Hall
2920, Frostfall
Anvil Chapel Hall
The Warrior's Charge May show up as leveled loot
Mythic Dawn Commentaries 1
You'll get it during the "Path of Dawn" quest
Destruction Mythic Dawn Commentaries 2 You'll get it during the "Path of Dawn" quest
The Horrors of Castle Xyr
Bravil Mages Guild, 3rd Floor
Response to Bero's Speech
Arcane University, Mystic Archives
A Hypothetical Treachery
Castle Skingrad, Lord's Manor
The Art of War Magic
Leafrot Cave
Mystery of Talara, vol. 3
May show up as leveled loot
Hand-to-Hand
Immortal Blood

Temple District, Seridur's House, Basement
Bruma: J'Ghasta's House
Bandit camp next to Ayleid Ruins across from the Sewer Exit

The Wolf Queen, vol. 2
Castle Skingrad, Lord's Manor
Ahzirr Traajijazeri
Bruma, J'Ghasta's House
Dark Brotherhood Sanctuary, Training Room
Way of the Exposed Palm
Fieldhouse Cave, Black Balconies of Fieldhouse
Master Zoaraym's Tale
May show up as leveled loot
Heavy Armor
Hallgerd's Tale
Chorral Fighters Guild, Tower (chest)
2920, MidYear
Chorral: Fire and Steel
Chimarvamidium
Imperial Legion Headquarters, Barracks
How Orsinium Passed to Orcs
Castle Bruma, Lord's Manor
History of the Fighters Guild
Arcane University: Mystic Archives
Chorral Fighters Guild
May show up as leveled loot
Illusion Mythic Dawn Commentaries 3 You'll get it during the "Path of Dawn" quest
The Wolf Queen, vol. 3
Bruma Mages Guild, Basement
The Argonian Account, Book 3
Arcane University, Mystic Archives, Upstairs
Incident in Necrom
Cheydinhal: Willow Bank
Palla, vol. 1
Arkved's Tower, Arkved's Death Quarters (accessible during Vaermina's quest - not sure if it's available otherwise)
Mystery of Talara, vol. 4
Fort Caratacus (exterior)
May show up as leveled loot
Light Armor
The Rear Guard
Dark Brotherhood Sanctuary, Training Room (chest)
Ice and Chitin
Leyawiin, Ahdarji's House, 2nd Floor, West (chest)
Lord Jornibret's Last Dance
Bleak Flats Cave
The Refugees
Cloud Ruler Temple, Great Hall
Market District: First Edition Books
Rislav The Righteous
May show up as leveled loot
Marksman
The Gold Ribbon of Merit
Dark Brotherhood Sanctuary, Training Room (chest)
A Dance in Fire, vol. 5
Bruma, Regner's House
Vernaccus and Bourlor
Chorral: Renoit's Books
Father Of The Niben
Castle Bravil, Private Quarters, North Wing
The Black Arrow, vol. 2
Dark Brotherhood Sanctuary, Living Quaters (Teinaava's Chest)
May show up as leveled loot
Mercantile
The Buying Game
Elven Gardens, Fathis Ules' House, Upstairs
The Wolf Queen, vol. 4
Market District, Office of Imperial Commerce
2920, Sun's Height
Mark District, Black Horse Courier
A Dance in Fire, vol. 6
Chorral: Casta Scribonia's House
A Dance in Fire, vol. 7
May show up as leveled loot
Mysticism Mythic Dawn Commentaries 4 You'll get it during the "Path of Dawn" quest
The Firsthold Revolt
Cheydinhal Mages Guild Basement
2920, Sun's Dawn
Skingrad Chapel Hall
The Black Arts On Trial
Market District, Mystic Emporium
Before the Ages of Man
Arcane University, Chironasium
Souls, Black and White
Fort Cuptor, Battlemains
May show up as leveled loot
Restoration
Withershins
Leyawiin Mages Guild Library
Notes on Racial Phylogeny
Chorral Chapel Hall (chest)
The Exodus
Skingrad Chapel Hall
2920, Rain's Hand
Bravil Chapel Great Hall
Mystery of Talara, vol. 2
May show up as leveled loot
Security
The Locked Room
Anvil Castle, Smuggler's Cave (chest)
The Wolf Queen, vol. 1
Bravil: Droshanji's House
Proper Lock Design
Waterfront District, Dareloth's House, Upstairs (only available after completing the Thieves Guild questline)
Advances in Lock Picking
Mach-Na (has a copy in his personal inventory)
Fingerbowl Cave
Surfeit of Thieves
May show up as leveled loot
Sneak
The Wolf Queen, vol. 6
Dark Brotherhood Sanctuary
2920, Last Seed
Bravil: City-Swimmer's House
Sacred Witness
Lake Arrius Shrine, Shrine Living Chamers (chest)
Legend of Krately House
Cloud Ruler Temple, East Wing
Purloined Shadows
May show up as leveled loot
Speechcraft
Biography of the Wolf Queen
Waterfront District, Armand Christophe's House (chest)
Reward for "Caught in the Hunt" quest
The Wolf Queen, vol. 5
Temple Distict: Hastrel Ottus' House
2920, Second Seed
Imperial City Palace: Imperial Battlemage's Chambers
The Wolf Queen, vol. 7
Castle Cheydinhal, Lord's Quarters