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- Germplasm Resources Information
- 21 nov 2014
- http://www.ars-grin.gov/
- U.S. Department of Agriculture
![USDA Nutrient Database](https://www.herbazest.com/imgs/4/3/3/216397/herbazest-usda_nutrient_database-index.jpg)
- USDA Nutrient Database
- U.S. Department of Agriculture
- 02 oct 2014
- http://ndb.nal.usda.gov/ndb/search/list
![USDA Plants Database](https://www.herbazest.com/imgs/2/b/a/514934/herbazest-usda_plants_database-index.jpg)
- USDA PLANTS DATABASE
- Natural Resources Conservation Service
- 23 jul 2014
- http://plants.usda.gov/java
- United States Department of Agriculture (USDA)