Am I allowed to post this PDF?

I have a really interesting read about this guy named William Buhlman, called Adventures Beyond the Body. It's basically a journal describing many of his experiences, how he does them, how he went from agnostic to a believer and what not.

I havent finished reading it (161 pages). The thing is, this is the first time I've read someone's experiences, tutorials, and how it changed them, and actually belived it.

So am I allowed to post it?