UNITED STATES DEPARTMENT OF AGRICULTURE
AGRICULTURAL RESEARCH ADMINISTRATION
OFFICE OF EXPERIMENT STATIONS
GOVERNMENT PRINTING OFFICE
U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 92, January-June, 1945. Washington. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc5064/. Accessed January 17, 2017.