1. Beck’s, D.E., 1977. Twelve-year acorn yields in southern Appalachian oaks. USDA For. Serv. Res. Note SE-244, 8 pp.
2. Beck, D.E., Olson, D.F., Jr., 1968. Seed Production in southern Appalachian Oak Stands. USDA For. Serv. Res. Note SE-91.
3. Burns, P.Y., Christisen, D.M., Nichols, J.M., 1954. Acorn production in the Misssouri ozarks, University of Missouri, College of Agriculture, Agri. Expt. Stn. Bull. 611.
4. Christisen, D.M., Kearby, W.H., 1984. Mast measurement and production in Missouri (with special reference to acorns). Terrestrial Series 13, Missouri Dept. Cons., Jefferson City, Missouri.
5. Seed production of southern Appalachian oaks;Downs;J. For.,1944