When it comes to my father's favorite books, there are way too many to list. Hans was an avid book collector who enjoyed everything from Chinese Medicine to Astrology, UFOs, Healing, Sexual Practices, Flowers and Nature. And of course, there were a lot of paranormal books in that stack, but I don't need to list those. Instead, if you'd like to get more of a look at the man behind the public figure, I'd advise you to read some of these favorites (some are no longer in print and require some searching to find).
T'ai Chi Ch'uan: Body and Mind in Harmony: An Ancient Chinese Way of Exercise to Achieve Health and Tranquility The Good News Publishing Company, North Canton, Ohio, circa 1975
I find this choice hilarious because his 'idea' of exercise was stretching in the morning, letting out a loud roar of a yawn and grabbing his first cup of Joe for the day!
Secrets of Life Extension: How to Halt or Reverse the Aging Process and Live a Long and Healthy Life by John A. Mann
Harbor Publishing Inc., circa 1980
He tried his hand at every trick in the book, literally! He gave up on his hair long before his hair knew it was doomed to be a dome however; the ladies still loved him and his witty charm. I read the book and it is simple yet clear as to what us humans need to be doing. Going back to the basics.