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• USDA National Organic Program, Agricultural Marketing Service (USDA NOP AMS) 
• Electronic Code of Federal Regulations for the National Organic Program (e-CFR Part 205)
• National Organic Program (NOP) Handbook
• USDA Organic Integrity Database
• USDA Certifier Locator
• Organic Materials Review Institute (OMRI)
• Organic Trade Association (OTA)
• USDA Organic Certification Cost Share Program (OCCSP) 
• USDA Transitional Production Plan