The Occult Roots of Nazism by Nicholas Goodrick Clarke
This is dull and boring as fuck; I had tried to read it once but abandoned it pretty fast. "The Spear of Destiny" by Trevor Ravenscroft is utter shit as well. "Unholy Alliance" by Peter Levenda is much better. Books like that are usually a waste of time because the authors who write them tend to approach the subject from an entirely different angle than somebody who is genuinely interested in that kind of stuff. Sometimes they even succeed in presenting a highly interesting subject like that in such a boring manner that you can't even read about it.
Instead, you could take a look at the publications by
The Black Order of Pan Europa:
https://nexion88.theblackorder.org
