UNITED STATES DEPARTMENT OF AGRICULTURE
AGRICULTURAL RESEARCH ADMINISTRATION
OFFICE OF EXPERIMENT STATIONS
GOVERNMENT PRINTING OFFICE
WASHINGTON : 1947
U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 94, January-June, 1946. Washington. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc5062/. Accessed July 23, 2014.