http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Perennial Weed Control Symposium, April 6, 1972
Perennial Weed Control Symposium (1972 : USDA Southwestern Great Plains Research Center)
Southwestern Great Plains Research Center (U.S.)
sponsors, Texas Agricultural Experiment Station [and others].