In reply to steelbru:
Biggars book and Brad Johnsons books are all right, though nothing can stay too accurate as route's seem to change season by season depending on conditions. Johnsons is just on the Blanca, so is more detailed than Biggars, which is on the whole Andes, so I would go for the Johnson book (But it is not completely accurate, especially the description for how to get to Esphinge!!!) There are a few climbers cafes (Cafe Andio and Cafe California,) in Huraz that have the books so you can read up/photograph routes without having to buy the books. Summitpost is good too for an online look.