Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: DO NOT BUY! it's hard to imagine a more worthless book

This book is a fiasco. As a professional in commercial space planning for many years, I picked it up based on a 'glowing review'. I find another few good ratings here on-line. The authors mother must be writing them, because no one who actually attempted to verify the faulty and incomplete information within, could ever see this tome as worth the paper upon which it is printed.One reviewer was accurate though; it isn't a bad door stop.