Originally Posted by ficbot
or to proof-read badly OCRd darknet copies
With any popular books, you can be pretty well assured that they have gone through multiple versions and multiple people making corrections to and republishing the material. That's why some random stranger on the street told me that if I did ever decide to look at books like that (not that I would) you would find them with revision numbers like v1.1, v1.2, v1.3, etc. as people made tweaks to them.