Books like The Complete Guide to Creating Oils, Soaps, Creams, and Herbal Gels for Your Mind and Body
Marlene Jones
The Complete Guide to Creating Oils, Soaps, Creams, and Herbal Gels for Your Mind and Body is 288 pages, about 5 hours 17 minutes at 250 words a minute.
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How long each takes
Aromatherapy for Women 3.2 h 
Aromatherapy 7.0 h 
Natural Healing for Women 7.7 h 
The Practice of Aromatherapy 5.1 h 
Aromatherapy Workbook 4.5 h 
Essential Oil Safety 14.4 h 
Practical Aromatherapy 2.9 h Bar height shows length. Estimated at 250 words a minute.