- All States Noxious Weed Seeds (pdf)
- Association of Official Seed Analysts (AOSA)
- Association of Official Seed Certifying Agencies (AOSCA)
- Colorado State University Seed Images Database
- Pure Harvest
- Society of Commercial Seed Technologists (SCST)
- The GRIN Taxonomy Home Page
- University of Wyoming Plant Sciences Department
- USDA PLANTS Database
- Wyoming Department of Agriculture – Technical Services Division
- Wyoming Seed Certification Service
- Wyoming Seed Law (pdf)
- Wyoming Seed Regulations (pdf)
- Wyoming Weed and Pest Council
