http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
21st International Horticultural Congress, 29 August - 4 September 1982, Hamburg, Fed. Rep. of Germany
International Horticultural Congress 1982 : Hamburg, Germany)
International Society for Horticultural Science
Working Group on Weed Control in Vegetables.
"Commission for Plant Protection; Working Group on Weed Control in Vegetables."