> Another commenter pointed out the anarchist's cookbook, which is another great book to read.

Again why is it a good example, it's not banned in any meaningful sense of the word. I can get onto Amazon and buy it right now.

Calling it a good book to read is quite a stretch as well. It's a poorly written assembly of instructions for bomb and drug making (written by a 19 year old). Many of the instructions being outright dangerous, so much so that it has been suggested that the book was actually a plant by the CIA, FBI... (not that this is a very credible conspiracy theory). If you want to learn about bomb making better just pick up a chemistry textbook.