Ancient Falmer Tomes

Background
The Unknown Books are four ancient tomes written in the Falmer Language that date back to the late Merethic Era.

The books are scattered throughout the Forgotten Vale and can be sold to Urag gro-Shub at the College of Winterhold. For each Unknown Book, he will award 1000 and a translated version of that book.

Unknown Book, Vol. I
Found in the Forgotten Vale just before the giant frozen waterfall and frozen river is reached. While walking down the slope after killing several Frostbite Spiders in a ravine, look to the right side of the path. It's by a skeleton and a chest. Alternatively, Use the Paragon Platform to reach the Wayshrine of Learning. Follow northwest along the river until arriving at the pillars across from the frozen waterfalls. There should be a chest, a skeleton, and Unknown Book, Vol. I just north of the tallest pillar.

Unknown Book, Vol. II
Use the Paragon Platform to reach the Forgotten Vale Overlook. Once there, follow the river north staying to the right side. Before the waterfall there will be a chest, some weapons, and Unknown Book, Vol. II.

Alternatively, reach the balcony of the Inner Sanctum and, using Become Ethereal, jump off the balcony onto the Forgotten Vale Overlook.

Unknown Book, Vol. III
Use the Paragon Platform to reach the Shrine of Resolution and head west to cross the bridge. Traverse through the ravine using the Falmer walkways. The book is in the southern most tent near the waterfall. If the book is still not found, go to the entrance of the Glacial Crevice and turn around to face north. Take the ramp up, follow the path and take the bridge on the left to get to the tent. Unknown Book, Vol. III should be sitting on the table.

Unknown Book, Vol. IV
After traversing through the Glacial Crevice, you will reach a small outdoor Falmer village. The book is located on a table in the boss level Falmer's hut near the end village and before the long tunnel.

Rewards

 * The Betrayed - the translation of Unknown Book, Vol. I
 * Journal of Mirtil Angoth - the translation of Unknown Book, Vol. II
 * Diary of Faire Agarwen - the translation of Unknown Book, Vol. III
 * Touching the Sky - the translation of Unknown Book, Vol. IV

Bugs

 * The objective "Bring Ancient Falmer Tome to Urag-gro Shub" may stack in the journal. It can be done with console command: SetStage DLC1VQFVBooks 200
 * Some books can disappear - they can't be found in the Forgotten Vale on their places.