[quote=@Dog]
Don't forget we gonna relearn how to do warfare too. Most military science and theoretical works were lost.
[/quote]

Yes, very important. I imagine a lot of it is self explanatory/ingrained into human nature, but some finer points will take some time to relearn. Interesting story potential. Logistics especially will be hard. 

*I don't imagine ALL books/sources were lost, necessarily. There's probably some of that still sitting around, will have to verify with the GM though. Maybe not, maybe something that should be left up to whatever we find out in-RP.