1. U.S. Department of Agriculture/Economic Research Service Data Sets http://www.ers.usda.gov/Data/FoodConsumption/FoodGuideDoc.htm
2. U.S. Department of Agriculture, Agriculture Research Service What We Eat in America, NHANES 2001-2002 http://www.ars.usda.gov/ba/bhnrc/fsrg
3. Friday JE Bowman SA MyPyramid Equivalents Database for USDA Survey Food Codes, 1994-2002 Version 1.0 http://www.ars.usda.gov/ba/bhnrc/cnrg/
4. U.S. Department of Agriculture, Agricultural Research Service Data Tables: Results from USDA's 1995 Continuing Survey of Food Intakes by Individuals and 1995 Diet and Health Knowledge Survey 1996