I'm sorry if this is not the best place for this, I couldn't think of anywhere better to ask about it
the reason most of these people are youtubers is because I went through my youtube subscriptions for ideas
edit: I've just realized I forgot to add rule to the title but I don't know how to fit it in there with it looking not bad
I believe his book Primitive Technology: A Survivalist's Guide to Building Tools,.... by John Plant. So you can buy it if you want to. :-D