Thanks for that. I went in and looked at the paper mulberry on that list and did some research on it. Looks like it is present in oklahoma so I guess I will be hunting a wild paper mulberry come spring as it seems to be a cool fiber/fodder tree.
I just went back to the site, and it appears that individual species can be downloaded (as many as you want), but not the entire book as a single download -probably causing too big a burden on their server - over 800 pages in one download!
They also have free downloads for specialty crops for the region, as well as other publications.
A great resource for those in tropical regions.