Garrett and others who read The Light in the Forest

http://www.pajack.com/stories/pennsylvania/regina.html

http://www.academicamerican.com/colonial/docs/Jemison.htm
 
http://portfolio.educ.kent.edu/mcclellandr/zackthezipper/easternwoodland.htm

http://www.indians.org/articles/eastern-woodland-indians.html



You could look up John Elder.  He was a real person, and there is some information about him on  Wikipedia under the article about your book.  

Henry Bouquet was real, too, so you could find out information about him.