• USDA/NRCS Plant Materials Center, Corvallis

• USDA Forage Seed and Cereal Research Unit

• OSU Integrated Plant Protection Center

• Oregon Society of Weed Science

• Herbicide "Genealogy"

Oregon Department of Agriculture sites

• "Weed Mapper"

• Oregon State Noxious Weed List

• ODA Pesticides Division

• Oregon Section 24c Herbicides (Special Local Needs Registration)