Ask HN: What information to store on the off chance of the Apocalypse?

Given 1 GB in printed pages is about 3.9 million (http://www.wolframalpha.com/input/?i=1+gigabyte+in+pages), how much would you store, what topics are most important (specifically in the areas of: survival in the wild, technology for rebuilding civilization, historical records, anything I've forgotten?), what media/medium would you store it on and how would you go about gathering it?