This handy shirt pocket guide samples 252 species of common and spectacular birds of Lima, Cuzco, Machu Picchu, Manu and other popular destinations. Each gets a large color photograph and description but, alas, no range map.
This authoritative and concise illustrated survey of Andean art and architecture covers not only Machu Picchu and additional Inca monuments, but also Chan Chan, Nasca and other archaeological sites and cultures.
A comprehensive, gorgeous and exhaustively researched field guide to the birds of Ecuador (and adjacent countries), featuring 96 color plates. It's also the best bird guide for travelers in the Peruvian Amazon.