http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
United States standards for grades of sweetpotatoes
Title from title screen (viewed on Apr. 2, 2008).
Mode of access: Internet from USDA web site. Address as of 4/2/08: http://www.ams.usda.gov/standards/sweetpotnew.pdf ; current access available via PURL.