This page of The Last of Us game guide contains information on where to find the training manuals and tools in the Lakeside Resort chapter. Those items are collectibles-secrets. Our walkthrough indicates the exact location of each artifact and pendant.
Description: Increased range of the smokescreen.
Once you reach the truck with a blazing barrel on it, walk over to the other side of the street and go to the back of the building. You will find a shed there which you can open with your knife. The manual is inside the shed.