The world's largest what is a part of UNAM's library?

Question

UNAM is a college in a spanish speaking country and I do not know which one but it has the world's largest something attached to its library

Answer 1

I know this is very old, but I'm tired of goodie-goodie two shoes like Mariana here.

People, do your own homework - I'm not going to be able to help you all the time.

UNAM's library has the world's largest mosaic mural.

Muahaha...

Answer 2

This is obviously a homework question. You need to do the research for yourself.