Here are some of the links to the general Atlas information for download in pdf form.
Atlas Key and Methods - The key and methods will be very helpful to understanding the information provided in the watershed pages.
Map Legend - The map legend will help describe the map at the beginning of each watershed section.
The watershed atlas files are in pdf format. If you need Adobe Acrobat Reader, it is free, and you can download the windows version here:
There are links to the other operating systems at the adobe site above.