It is a book. The Anarchist Cookbook by William Powell, first published in 1970.
The author has a nice piece written on Amazon (the link above). Scroll down to "Editorial Reviews - From the Author". He basically says that he rehashed things he found in other books at the NYC public library. It was a good basis to start with, but it shouldn't have been the finished product.
It sounds like you're talking about all those random text files that have been in circulation for decades. Most of those are junk too, written by people who barely have a grasp of the subject material. I used to really enjoy reading them, and as my real-world experience grew, I realized how many of them were worthless noise.