This is a popular book. Still the only modern guide for Argentina and the southern parts of Brazil.
The book starts with the plates and descriptions, which followed by some black-and-white plates for flying raptors, and the maps closes the book
Personally I find the illustrations disappointing. In this book it seems that all the forest eagles and hawks have the same powerful built like the Harpy Eagle (which is not true, especially for the Crested Eagle, which looks a bulky bird in this book) or you will think that the King Vulture is the smallest of the neotropical vultures (which is the largest after the Condor). Usually there are 10-15 species on one plate, which makes them very crowded.
On the positive side, the authors tried to fill the space with text, so you wont find a page which is only "half-full". In some cases the text is more useful then the pictures.
The area which is covered, still lacks a good bird book, so I still suggest to buy this. Chile is an exception, the book called Birds of Chile by Jaramillo is far better.