The author you noted is very popular among the Amish and well known among most plain peoples. I have no beef with his methods, I do not like his barley grass powder ix that he sells for a fortune, it is a diluted product and one I do not reccomend. If your going to take grasses, take them pure with out fillers, etc.
The problem your going to have with my authers is this, they seemed to have written 1 book and usually well after retirement and they didn't reprint, they were all 1st prints and small volume and I will bet there are thousands of small run books out there hidden in storage shelves!
I studied herbs and herbal books for years and I will tell you they all bark up the wrong tree! Herbalist do not live longer than the average person in general! I did well on herbs, but they never changed my life! Do a search for books on "Fasting" and you will find dozens if not hundreds from all around the world.
These are the books that will change your life. If you want to know what I know, you should have asked for my free 108 page seminar guide book, then most of your questions would have been answered. If you then ever decide to try my first schooling book, all of my things are 100% guaranteed, so all you have to do is send it back if you don't want it and then your couriosity will be cured and maybe then you will be your own doctor for the rest of your life.
It really is of no value to start giving names of books that have been out of print for 80-150 years. Please read my booklet first and then you can ask me questions by mail for the rest of my life, I do this for a hobby and you will get a whole lot more answers on a private basis. I do not want the few hecklers making fun of any book I may believe in, etc.