Secret Teachings of All Ages by Manly Palmer Hall (2003, Paperback, Reprint)

I was led to search for this book by its mention in several other books that I was reading on the Golden Dawn, B.O.T.A., Rosicrucianism, and Inner Light Society. I was able to find it quickly and easily through eBay, and at a much reduced price from other sites I visited.
If you are a true seeker of deeper Mystic Knowledge and Traditions, this book is for you. Manly Hall has created an exhaustive reference book to almost all knowledge of the Western Mystic Traditions. Of course, there are many secrets that cannot be divulged by this writer or any other as they must be passed 'by mouth to ear', but it still stands as a masterpiece of encyclopaedic knowledge for anyone who is seeking truths and descriptions that are simply hardly found anywhere else.
Even though this version has been annotated somewhat from the original, it is still brimming with probably more knowledge than the average person is capable of assimilating; the illustrations are useful, well placed and quite interesting.
I would highly recommend this book to anyone who seeks deeper knowledge of western Mysticism and Traditions.

This reader's edition is easy for me to understand. It is much like an encyclopedia of esoteric information. It contains many illustrations, many of which are in color, with clear explanations.