This book is a 3-way cross reference covering over 110 EOs. In this extremely handy and QUICK reference book you will find three groupings or categories for cross reference. You can find the oils for specific problems, you can look up what oils treat what problems, or you can search properties to find the oil that best suits your needs. This book should also assist you in finding just the right combinations of oils to blend to get the desired therapeutic effect. Under the oils grouping there is a "blends well with" category. Once you use this book a few times you won't be able to live without it!