We have a wonderful digital library to recommend to you, Audubon Birds of America hosted by the University of Pittsburgh. You can find 435 digitized images of original pictures from John James Audubon’s Birds of America and Ornithological Biography.
This great collection allows you to view these classic bird drawings in high quality with the ability to zoom in. Each image has a record that links to the full text entry about the bird digitally scanned from the actual book. A very interesting resource, not just for birdwatchers!
