Instruct: Classify a given Amazon review as either positive or negative.
Query: Yuraq Janka : Guide to the Peruvian Andes

The book is a good research of all routes and it offers a nice historic review of the climbs. However, as a guidebook is useless. The author admits that only brief descriptions of the routes are given since he wants to preserve the nature of Andean mountaineering. This, in my opinion, is the wrong perpective of what a guide book should be. I can go to Peru and ask around and get the same brief description at no cost and bear the same risk of getting lost.