The graph only shows one dot corresponding to the first sighting date, regardless of how long the bird stayed. In terms of information provided, both books are about the same differing only in presentation. References 500 species. Starts with a description of habitat categories that are later referenced to the left of the bar graph. A major difference from TAS occurs when only a few records exist.
Graph shows dots corresponding to the entire period that the bird stayed.
The purchase of this guide supports the educational programs, and conservation and ecological projects of the Northern Arizona chapter of the National Audubon Society. Not very detailed but the Coconino section is useful because birding information for the area is hard to come by. A superficial guide to the state - not very good. Currently out of print. Very detailed with species accounts, distribution bar-graphs, Christmas Bird Count information and a 26 page birdfinding section.