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updated: February 20, 2008 (corrected the link)
Download the USDA data needed for DMAK.
sr20.zip
Alternatively you can do it the hard way and find the USDA website and then find the latest version of their data and the correct form of that.
After you have downloaded USDA's Standard Reference, unzip it into dmak's subdirectory 'usda_data'. That's it.