If it is educational, interesting, fun, and healthy, as well as applying the new knowledge to marijuana-concentrates you are looking for, then I believe these books would be for you.
Modern Essentials, A Contemporary Guide to the Therapeutic Use of Essential Oils, Sixth Edition
Essential Oils pocket reference Sixth Edition - Life Science Publishing
Rosemary Gladstar's Herbal Recipes for Vibrant Health -
Rosemary Gladstar's Medicinal Herbs, A beginner's Guide
The Complete Book of Essential Oils & Aromatherapy - Valerie Ann Worwood
The Complete Medicinal Herbal - Penelope Ody
There are countless guides available and I sure wish I had the money and time to purchase and study all of them. My dream is to become a master herbalist and aromatherapist.
An example of how it can be a benefit to marijuana applications. One of these books offers a complete breakdown of carrier oils, which to use and when, for topical applications. Currently I am using fractionated coconut oil as my carrier oil for topicals. Another book offers a complete breakdown of what essential oils are best used for specific ailments. The possibilities are endless!