Although I've read negative reviews about the 1999 edition, over the past ten years I have used "Trekking and Backpacking in Peru and Bolivia" as a reliable source of information both for myself and friends. Sure, some of the details are outdated, but there isn't a travel guide out there where that isn't the case. What I like about the Bradt publication is that it rounds out the hiking experience, offering alternatives and interesting insights. I have found especially valuable the 1995 ed. section on Bolivian National Parks--the information provided a gateway to some amazing adventures I had in the Apolobamba (a must see) and Amboro National Park. I know Bolivia quite well, and can say that this book is an important addition to the Andean travelers backpack.