The Complete Book of Essential Oils & Aromatherapy is an excellent book for the beginner and a useful reference for the more advanced aromatherapy user. Included within this 427-page volume is the following:
An introduction to essential oils that includes safety information, how to use essential oils, oil quality, methods to use the oils, etc.
A chapter describing the 10 essential oils the author suggests as the oils to have if you could only choose to buy 10.
Over 600 recipes and synergies that utilize essential oil blends. The recipes are divided by chapters into relevant topics such as travel, hair care, body care, active individuals, use at work, use at home, for men, for women, children, cooking with oils, animals, and celebrating. What makes these recipes especially nice is that it's not just a "cook book." If you are looking for a synergy to aid with a medical problem, for example, she not only lists several recipes or synergies for most items, Worwood usually also provides background information on the problem and information on how to properly use the blend for best results.