Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Buy this book...it might just save your life!

I read this book and it is insightful, truly helpful, and packed with good, solid information. I am an avid outdoorsman, athlete, SCUBA diver, mountaineer, and never have I come across such a well presented in-depth, "survive everything" book. The book first was published in the 60's and has been out of print until now. I saw the negative review below and was appalled that the reader just didn't get it. Perhaps the reader below didn't appreciate the unique style of Greenbanks approach. Greenbank refers to this as "telegraph" style. Or maybe the reader was secretly the author of a competitive book. Whatever it may be, ignore it.Tony Greenbank is real. His ideas are sound and many people have been utilizing his ideas for more than 30 years. It is a book worth having, reading, and remembering.