In-Universe documents, typically private, from incident reports and declarations of war to threat assessments.

Creed of the Equestrian Royal Guard

Dangerous Magical Artifacts Known To Equestria

Gryphon Empire Declaration of War upon Equestria, Circa 2,103 A.D. (fun fact, I actually do all of my writing in Word and I had epic fonts picked out for the signatures but I can't fuggin post those here and pastebin doesn't allow fonts reeeeee)

Incident Report: Battle for New Canterlot, Circa 2,422 A.D.