Dear Lauren Turner:
Thank you for posting on History Hub!
If you have not done so already you can contact the U.S. Forest Service and see if they have that information available to the public.
Here is an interesting speech given by Dale Bosworth on African-Americans in Forestry: Broadening the Circle of Conservation. Also, a document written by the African American Strategy Group of the U.S. Forest Service. Both may be helpful to your research.