Also of note:
If you miss volumes 1, 3, 14 because they are limited time items whose locations won't appear again because of the storyline, you can get this three books again at the Desert Oasis.
Method of re-gaining volumes 19 ~ 22 is unclear at the present point.
When Al Bhed people speak, the translated text are the red letters.
The blue letters are Al Bhed letters that are yet to be translated.
After getting all 26 books, you can receive "Reverse Key" from Lin
Using Combine Spheres in inns and other locations, you can turn your collected Al Bhed books from your previous save into Al Bhed
Dictionaries in the present game. It is added to the Important Item list.