Good for you, sounds deeply interesting.
What is a real-world post-apocalyptic document?
Post-apoc novels are becoming almost literary, with The Road (which I loved) winning the Pulitzer.
However many of them that I read, like Snow Crash, are badly done. They are either clunky or pretentiously hip. I truly enjoyed A Canticle For Liebowitz.
See Augustine's City of God. When his world fell apart (with the sack of Rome), he laid the foundations for a new social order.