The US Army's Survival manual is much more useful imo. It's an actual guidebook covering all kind of survival techniques and practical informations (very basic things too like how to build a fire which most urban people doesn't even know) https://irp.fas.org/doddir/army/fm3-05-70.pdf

For nuclear and other hazards see chapter 23/page 358 (Survival In Man-Made Hazards)