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Do you mean that text file "by" Jolly Roger (who just compiled a bunch of other shit and took credit for it. I once found a home-made self extractor called "anarchy.exe" which was filled with most of the original cookbook files, only they were all credited to different people. Yeah, I didn't have a virus scanner and downloaded a file called "anarchy.exe" from some random site, and ran it. Boy did I get lucky), or the paper cookbook?
The text file is probably insanely dangerous. There's even a website that parodies it by randomly generating bomb instructions. I've not seen the paper book, but apparently it was paraphrased from poorly-photocopied old survivalist manuals, probably written by bunker-builders in the cold war, who themselves had second-hand military knowledge from WW2, Korea or Vietnam. I wouldn't mess around with that, either.