I have finally gone through every single page of this book!!! It is so thorough that it took me over a year to complete it. I don't know that there is another book out there that provides a more comprehensive index of essential oils. Calling it an index truly minimizes the description of this book. It has so many different oil combinations to make bug/pest repellents, tinctures, teas, aromatherapies, topical solutions, perfumes/room fragrances and deodorizers, and so much more. If I'm experiencing any symptom that I can describe, I can use this book to help me figure out which oils are best to alleviate them. I am pretty healthy, so it's not often that I have to pick up the book for that. Most of my inquiries center around my cycle and other feminine issues. However, I do refer to it for aromatherapies, household issues, and just for general knowledge. No matter how much I already knew before purchasing and reading this book, I learn something different each time I pick it up. I will certainly refer to it again and again. And when a new edition is released, I will purchase it and read it through as well.