If you're planning a tour of the American Southwest these brilliant books are simply the best possible guide to what to photograph, and how. In three volumes Martrès guides you to all the photographic highlights of Arizona, Utah, Colorado and New Mexico. At the well known tourist spots he tells you what and when to shoot for best results, but he's also not afraid to take you off the beaten path to some less frequently visited scenic gems.
I've just completed a photographic holiday following roughly the traditional "grand circle" route, and I couldn't have got some of my most successful shots without these books.
The author provides consistent, detailed instructions for each location, including guidance on lenses and timing. Sometimes he even tells you which rock to stand on! Follow his instructions carefully, and you'll usually get good results, although some instructions require careful interpretation.
It's also great fun shouting "snap!" when you realise the only other souls in some lonely location are also clutching a copy of the same book.
All three volumes have recently been updated, with high quality colour photos throughout, and a comprehensive index of locations including ratings for accessibility and scenic and photographic value, invaluable if a tight schedule means making difficult choices.
I'm already planning my next trip using volume 3! Highly recommended.