Instruct: Classify the given Amazon review as either positive or negative.
Query: Very Good Reference Manual

We enjoy this book greatly for looking up illnesses and diseases for information and treatment.However, I have a suggestion for the publisher. The book can be greatly improved if in the index the main page or pages to look at first were shown in bold print. This would save the user lots of time for so many of the subjects show several pages to search. Some turn out to be useless.