The Last of Us: Bus Depot, Comic Books The Last of Us Guide, Walkthrough
This page of The Last of Us game guide contains information on where to find the comic books in the Bus Depot chapter. Those items are collectibles-secrets. Our walkthrough indicates the exact location of each artifact and pendant.
Comic #12 - Precipitate

Once you finish observing the giraffes with Ellie, walk through the nearby door and climb down the stairs.

This way you will reach a big room with men's restroom to the right.

The comic is inside.
Comic #13 - Catalyst

Once you throw down the ladder to Ellie inside the tunnel, turn right.

You will notice a ventilation shaft there. At the end of the shaft, there is the thirteenth comic.