Hypothetically, if governments wordwide just suddenly became authoritarian and deleted all records of history, you and some survivors escape to a remote area outside of government control, they all can’t remember much from history (either didn’t pay attwntion in class, or suffers memory loss from the governemtn attacks) and so you are designated as this community’s official historian. How much can you remember? What’s gonna be the official narrative of your little rebel community?
Yeah, I have curated my library to be focused on the history of science, with special focus on the sorts of books which include information necessary to bring society to the technological equivalent of the age of reason (with extra chemistry and medicine). At that point, it’s mostly practical, and the practicality of the source speaks to the likely authenticity of other texts within the collection.