Instruct: Classify a given review into positive or negative sentiment.
Query: An astoundingly good book that wears extremely well

I brought this book with me on a trip to Thailand and Laos about 6-7 years ago and I am still reaping the rewards. As a social scientist with a tangential academic interest in this region in which I love to travel, I keep coming back to this book on matters of transportation, commerce and life on the upper Mekong. I learned SO much about what I was seeing from this book. Thank you so much for writing it, Professor Walker.