A Tragedy in Black:
- Bruca's Leap Redoubt, on a book shelf.
- Eldergleam Sanctuary Treasure Crate, an unmarked location.
- Glenmoril Cavern, inside the northernmost room, on top of an arcane enchanter.
- Ilinalta's Deep, on a table at the northeast corner. The room also contains an arcane enchanter and an alchemy lab.
- Shrine of Akatosh, an unmarked location.
Catalogue of Weapon Enchantments
- Awarded by Urag gro-Shub at the College of Winterhold upon successful completion of the quest Hitting the Books.
- Leaning in front of the chest in Roadside Ruins.
- Inside The White Hall in Dawnstar. In the room on the left on the ground floor with the training dummy inside. Look in between the ------ - Barrels right by the door (between the second large barrel and the small barrel).
- Castle Dour, Emperor's Tower, upstairs on a table.
- Darkwater Pass, atop the Arcane Enchanter.
Catalogue of Armor Enchantments
- Fort Amol's lowermost level, on a bookshelf next to an Arcane Enchanter.
- Shrine of Mehrunes Dagon.
- Falion's House in Morthal, on a bookshelf.
- Wreck of the Brinehammer, on the floor of the "Below Deck".
- Steamscorch Mine, on a table at the end of the first tunnel.
Enchanter's Primer
- Found in Hob's Fall Cave on the Arcane Enchanter.
- Found in between the bed and the end table in Carlotta Valentia's House in Whiterun.
- Honeyside in Riften opposite Arcane Enchanter after becoming Thane in Riften.
- Near a small unmarked location, Juniper Shrine, north of Valthume.
- In the unmarked location, The Dead Refugees, west of Whistling Mine.
Twin Secrets
- Treva's Watch on the far northwest side of the map up the stairs. It sits on a table next to the Arcane Enchanter.
- Calcelmo's Laboratory on the table across the room from the Arcane Enchanter.
- Shrine of Stendarr just southeast of Swindler's Den.
- Serpent's Bluff Redoubt on the enchanter's table.
- Jarl's Longhouse in Winterhold, in the ground-floor room on the right, inside of a basket on top of a barrel.
Hope this helps you out. Drop a koin if it did