Question about Carthage and Codex

[Wenatchee Willie]

I'm playing as Augustus in Carthage, the Civ where you can only have 1 city. Things are going well but I'm maxing out my codex storage. It's not letting me build a library in my towns, so I'm stuck at trying to figure out how to increase my codex storage. Any tips would be appreciated.

Thank you kindly

[Evrach]

You have a policy called Sicilian Wars that adds 1 Codex slot in City Halls in Towns with the Trade Outpost focus. It’s the mastery that gives the slot to be exhaustive.

[Wenatchee Willie]

Thank you.

[Goof]

Nalanda has 2 slots as well. i think it comes with 1 codex so i guess its really just 1 slot

[Bandit17]

You can also take an enemy city that has a library/academy in it but, like it was pointed out above, just taking your proper civ mastery solves the problem.