(he has other articles I would recommend taking a look at, too --- check them out if you're interested! )
Link : https://www.coursera.org/course/bitcointech
You can build the ePub from source:
Or get it from oreilly:
Is this really freely available? I'd much rather see Princeton release this book to the public domain.
So it's not really all that free in my opinion, even with your additions. /s