FDA FAQ on food labelling. Found at HealthFinder.gov. See also health.org's labelling resources.
USDA's Food and Nutrition Service. See especially the FAQ, with links to primary sources on USDA tables.
This is BrainLog, a blog by Dan Sanderson. Older entries, from October 1999 through September 2010, are preserved for posterity, but are no longer maintained. See the front page and newer entries.
July 31, 2000