This is a fairly good book, a rapid (rather than sustained) review of a wide range of figures and far-right phenomena (internationally): from Rockwell to occult nazism (Savitri Devi and Miguel Serrano) to Christian Identity, Odinism, and New World Order ('Illuminati') conspiracies. Helpfully, the book is well bibliographed. Goodrick-Clark is always sober, and authoritative. This book forms, as I said before, a good compliment to Gregor's richer (but somewhat quirkier -- I never cease to be amazed by his defense of the Salò Republic!):
http://www.goodreads.com/book/show/3045620.The_Search_for_Neofascism. About the only overlap between the two books is Julius Evola -- As Gregor himself started life as a devotee of Evola, his account is more authoritative; Goodrick-Clarke's is much easier to read, though.