http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
stress day concept to improve nitrogen fertilizer utilization
dryland grain sorghum in the Texas Blackland Prairie
D. E. Kissel, J. T. Ritchie and C. W. Richardson.
Miscellaneous publication (Texas Agricultural Experiment Station) ; 1201