This resource pack gives every enchanted book a unique texture, making it much easier to find the one you need at a glance. Each book’s cover color is themed based on the type of enchantment and the items it can be applied to, helping you organize and identify them quickly in your inventory or storage.

Since 1.21.5 You do not need any additional mods
From 1.20.5 to 1.21.3 I would recommend using CIT: Hotfix for Enchanted Books
From 1.13 to 1.20.4 You should use any mod which supports the CIT standard like CIT Resewn or Optifine
You can also run this as a standalone mod

Examples of the new textures

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Mars's Enchanted Book Textures

EnchantedBooks

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