Description based on: 2006; title from title screen (viewed Mar. 23, 2009).
Latest issue consulted: 2008.
Mode of access: Internet via the USDA Agricultural Research Service web site. Address as of 3/23/09: http://www.ars.usda.gov/research/projects/projects.htm?ACCN%5FNO=410741&showpars=true&fy=2006 ; current access available via PURL.
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