National Governors' Association
National Council of State Legislatures
The Brookings Institute
National Academy of Science
Mathematica Policy Research, Inc.
Center on Budget and Policy Priorities
Food Research and Action Center (FRAC)
America's Second Harvest - Ending Hunger
National Archives & Records Administration
The Nelson A. Rockefeller Institute of Government
National Association for Welfare Research & Statistics (NAWRS)
This site has a list of state government web sites on the food stamp program.