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National Organic Program : certifying agent accreditation and agreements with foreign governments
- United States Agricultural Marketing Service.
- National Organic Program (U.S.), Natural foods -- Certification -- United States, Natural foods industry -- Standards -- United States, Organic farming -- Government policy -- United States, organic foods, organic certification, international trade, food policy, and United States
- U.S. Dept. of Agriculture, Agricultural Marketing Service
- USDA publications