I have an offline copy of wikipedia together with the images (especially for diagrams, and plant recognition) on my phone. I also have fairly detailed offline

I have an offline copy of wikipedia together with the images (especially for diagrams, and plant recognition) on my phone. I also have fairly detailed offline maps of most of the world (including contour lines in some places). Add some decent solar power to that, and scavenge for spare parts to keep it going, and I plan to be running a First Foundation / Oracle of Delphi pretty shortly after civilization collapse.