1. USDA, National Agricultural Statistics Service 2002 2002 Census of Agriculture, Ranking of 2002 Market Value of Agricultural Products Sold http://www.nass.usda.gov/census/census02/topcommodities/topcom_US.htm
2. USDA, National Agricultural Statistics Service 2002 2002 Census of Agriculture, Table 50. Selected Characteristics of Farms by North American Industry Classification System http://www.nass.usda.gov/census/census02/volume1/us/st99_1_050_050.pdf
3. USDA, National Agricultural Statistics Service 2002 2002 Census of Agriculture, Table 16. Beef Cow Herd Size by Inventory and Sales http://www.nass.usda.gov/census/census02/volume1/us/st99_1_014_016.pdf
4. USDA, ERS, WASDE 2002 www.usda.gov/oce/commodity/wasde/
5. NAHMS 1999 Part 1. Baseline Reference of Feedlot Management Practices http://www.aphis.usda.gov/vs/ceah/ncahs/nahms/feedlot/