U.S. Department of Agriculture. Office of Experiment Stations.. Report on the Agricultural Experiment Stations, 1940. Washington. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc4984/. Accessed June 19, 2013.
U.S. Department of Agriculture. Office of Experiment Stations.. Report on the Agricultural Experiment Stations, 1940. Washington. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc4984/. Accessed June 19, 2013.