Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A Very Informative, Worthwhile Read

Darley gives a wonderful overview of the Natural Gas industry and how it works. He does not get too technical or bogged down in details. Keeps the flow of the read focused on the "big picture". Although he has a "wee-itty-bit" of a liberal lean to his perspectives, the overall content is generally focused on fact and well accepted economic principles. I found the time spent reading this book well used. Darley was rarely verbose and delivered a lot of insight into the Natrual Gas industry as source of energy for today and the future.