The Manson File edited by Nikolas Shreck.-Probably the only out and out pro-Manson book that has ever been published. Contributers range from Manson sympathizers to out and out "family" members in essays and art. The good bulk of this book however is straight from Charles Manson himself. Interviews, quotes, transcripts of court and parole hearings, poetry and fiction written by Charles Manson, even  artwork by him. The Manson File is probably the best book you can get to learn anything about Manson and his philosophy.
Myths and Symbols in Pagan Europe:Early Scandinavian and Celtic Religions by H.R Ellis Davidson.-Davidson has done a great job with this book in setting out to show the similarities in the religious/cultural practices and beliefs of the Germanic and Celtic heathens. My personal belief is that the Gods of the Norse and other Germanics are the same Gods as those that the Celts worshipped, even if the names, lore and rites differed in various ways. She draws heaviest from the Irish sources instead of Welsh, Brit and continental Celts for drawing comparisons to Germanic peoples but even those are far from being totally neglected. Personally I don't how anybody could deny, even coming from the academic egghead perspective , that Odin and Lugh are anything other than the same God after reading this book.

From an academic/historical perspective this is probably the best book ever written on Odinsim. 
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Confessions of an Eco-Warrior by Dave Foreman.-Before they were taken over by politically correct left coast weenies Foremans Earth First! was a very cool thing. They were "redneck hippies" who had a love for American wilderness and took radical steps to conserve it. Written after the FBI's attempt to set him up on bogus charges and after he left EF! Foreman lays out his ideas on conservation/ecology and his reflections on his life and times in the environmental movement. There is an emphasis on the wilderness in the western United States with Foreman but thats to be expected considering thats where he's from. Excellent auto-biography from an admirable man who has a lot of interesting ideas.
Conan by Robert E. Howard-I read the old 1-12 Tor/Ace Conan paperbacks religiously when I was a teenager and still love the Howard written Conan stories just as much, if not more, than I did then. Because of so many bad movies, comics and free reign given to authors undeserving to write stories involving this character (some of the written by other than Howard Conan stuff is very good, most is not) many people do not understand the true nature, depth, and greatness of this character and Robert E Howards work. These stories are often as much horror stories as much as they are sword and sorcery adventure tales, or at least a fusion of the two. There is also a philosophical side of Conan that is one part might is right style social darwinism, mixed with an Aryan warriors sense of honor and chivalry along with a Viking berserkers battle ecstacy. His attitudes on life, race and women are so politically incorrect I have to wonder if any major publisher would have the balls to put out these stories if Howard were getting started now. What a great thing that these books are finally back in print in huge, very affordable, and nicely illustrated (I still love the Frazetta covers on the old paperbacks the best though) non-watered down pure Robert E. Howard written volumes!
The Silent Brotherhood by Kevin Flynn and Gary Gerhardt.-This is a "true crime" style  account of Bob Matthews and The Order. It was a lot more fair and impartial than I expected. Not perfect by any stretch of the imagination (and neither was The Order themselves) but even members of The Order have said it is more or less accurate except for minor details and the dialogue that the authors threw in. This is still a must read book if for no other reason its the best book about Bob Matthews and The Order that has been put out and is written in a way that keeps you interested the whole way through. Whether you consider them terrorists or freedom fighters you will probably get something out of this book.
Tales of the North by Jack London-I found this on the bargain table at a bookstore. This includes three GREAT Jack London novels, Call of the Wild, White Fang, and The Sea Wolf, along with 15 of his Alaskan wilderness short stories and Cruise of the Dazzler as well.This book can be found on amazon.com for less than a dollar most of the time so as far as bang for your buck you can't do better than picking up a copy of this book.