http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Effect of urea and sulfur coated urea on the dry matter and protein production in Gulf ryegrass
D.G. Westfall, A.W. Smith, and G.E. Evers.
Progress report (Texas Agricultural Experiment Station) ; 2906