Really interesting question. I'm answering from the perspective of a civilization ending or resetting event, rather than say, a disaster like a hurricane.

Wikipedia to start. But IMO that's not good enough as it's not very discoverable, but makes a great 'for further reading.'

Definitely world history content. Lack of written record is probably one of the most frustrating aspects when studying past civilizations.

Definitely books and such on planting, crop rotations, problems, etc.

Books on maths, physics, geography, biology, chemistry, etc. Probably at least 101 level.

Once I covered those bases, I'd probably fill the rest with video, music, and photo content, though I'm not sure yet of what or how much