I needed little's ranges for a school project, but they are in a very inaccessible format. This repo holds both the data itself and a working script to get these geojsons from the USFS website.
Thanks to the USFS for the original data: Prasad, A. M. and L. R. Iverson. 2003. Little's range and FIA importance value database for 135 eastern US tree species. http://www.fs.fed.us/ne/delaware/4153/global/littlefia/index.html, Northeastern Research Station, USDA Forest Service, Delaware, Ohio.