IF the list of books I want, but cannot afford, wasn’t already so long, I’d already have The Red Book in my possession. ONE DAY. 
What I find the most fascinating about it is the assertion that he could induce these experiences “at will”. This is a pandora box topic, so I won’t elaborate, but I’ve explored this personally before I was aware of it as being “a thing”.
■■■■ I derailed again.
You can get it for free here - just click on the title and then the “download” at the top of the page (ignore all the ads).
http://libgen.io/book/index.php?md5=5989B7D57F08DE6C04E5CE00539A268D
Personally - I suspect there isn’t much to be learned from this old a source. Science has moved very far from where it was back when Carl Jung was alive and writing.
More about the source of these free books:
The Library Genesis project: The easiest way to find full-text (books and) articles online (illegally)?
Shhhhhhhhhhhh don’t ruin it!!! 
And I tried downloading before but it’s the original Red book, with his handwritting not the translation.
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